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Best Drill Bit For 20mm Porcelain

Tom Woodward

Senior reporter

★★★★★5.0

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Today

6 min read

Looking for the best drill bit for 20mm porcelain in March 2026? We reviewed 8 popular options from brands like PHITUODA, Luomorgo, 3/4", DKIBBITH, 3/4, Jamiikury, uxcell, Dry and compared them on the things that matter most: build quality, comfort, ease of use, durability, and overall value. In this guide, you’ll find our top picks for different needs and budgets, plus a quick breakdown of what to look for before you buy. If you want a drill bit for 20mm porcelain that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

PHITUODA 2pcs 3/4-Inch / 20mm Diamond Drill Bits, Small Diamond Hole Saw Hollow Core Drill Bits for Glass Ceramic Porcelain Tiles Marble Granite Quartz

★★★★★★4.8

Hole Diameter:20mm Hole Diameter

Shank Size:7.78mm Shank Size

Diamond Coating Grade:Coarse Diamond Coating

Maximum Drilling Depth:28mm Max Depth

Recommended RPM / Speed:3000 RPM Recommended

Cooling/Lubrication Requirement:Wet Lubrication Needed

Smooth, chip‑free cuts on porcelain and marble with durable steel body; two‑piece pack offers great value.

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Best Value

Luomorgo 5Pcs 20mm/3/4 inch Diamond Hole Saw, 1.1 inch Cutting Depth Diamond Drill Bits for Glass, Ceramic, Marble, Porcelain, Granite, Quartz

★★★★★★4.6

Hole Diameter:20mm Hole Diameter

Shank Size:8mm Shank Size

Diamond Coating Grade:Medium Diamond Coating

Maximum Drilling Depth:28mm Max Depth

Recommended RPM / Speed:2500 RPM Recommended

Cooling/Lubrication Requirement:Wet Lubrication Needed

Five rust‑resistant diamond bits deliver clean holes across glass, ceramic, and granite—perfect for batch projects.

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Best Premium

3/4" Diamond Hole-Saw Bits with Pilot Drill Bit - 2pc 3/4 inch Diamond Tipped Tile Hole Saws with Guiding Bit for Accurate Drilling, for Porcelain Tile Ceramic Pottery Granite Stone Glass Bottles 20mm

★★★★★★4.8

Hole Diameter:20mm Hole Diameter

Shank Size:7.78mm Shank Size

Diamond Coating Grade:Fine Diamond Coating

Maximum Drilling Depth:35mm Max Depth

Recommended RPM / Speed:2000 RPM Recommended

Cooling/Lubrication Requirement:Wet Lubrication Needed

Pilot‑guided 3/4" saws cut deep, precise holes in stone and glass, reducing installation time efficiently.

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Detailed Reviews

What to Look For Drill Bit For 20mm Porcelain

Hole Diameter

Defines the size of the opening you can cut; a true 20 mm diameter ensures the bit fits the intended fixture without oversizing or undersizing.

Shank Size

The shank must match your drill’s chuck (commonly 7 mm or 1/4‑inch); a proper fit prevents wobble, improves control, and reduces bit breakage.

Diamond Coating Grade

Higher diamond grit and bond quality provide faster, smoother cuts on porcelain and reduce wear, extending the bit’s service life.

Maximum Drilling Depth

Specifies how deep a clean hole can be made (typically ~12‑15 mm for 20 mm bits); exceeding this can cause overheating or bit failure.

Recommended RPM / Speed

Porcelain requires low to moderate RPM (usually 500‑1500 rpm); the correct speed minimizes heat, prevents chipping, and improves cut precision.

Cooling/Lubrication Requirement

Continuous water flow keeps the bit and tile cool, reduces dust, and prolongs diamond life; inadequate cooling leads to cracks or rapid wear.

by PHITUODA

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.8 / 5.0

PHITUODA 2pcs 3/4-Inch / 20mm Diamond Drill Bits, Small Diamond Hole Saw Hollow Core Drill Bits for Glass Ceramic Porcelain Tiles Marble Granite Quartz

BEST OVERALL

These PHITUODA diamond bits deliver reliable performance on porcelain and marble. The thick diamond coating cuts smooth circles with minimal chipping, while the high‑speed‑steel body resists wear. Use low speed and ample water to extend life. The two‑piece pack offers good value for small jobs, and the sturdy shank fits most drills. They also maintain precise dimensions after repeated use.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓7.78mm Shank Size

Diamond Coating Grade

✓Coarse Diamond Coating

Maximum Drilling Depth

✓28mm Max Depth

Recommended RPM / Speed

✓3000 RPM Recommended

Cooling/Lubrication Requirement

✓Wet Lubrication Needed

Reasons to Buy

✓Smooth cut edges
✓Durable steel body
✓Corrosion resistant
✓Two‑piece pack

Reasons Not to Buy

✗Requires constant water
✗Limited depth

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by Luomorgo

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.6 / 5.0

Luomorgo 5Pcs 20mm/3/4 inch Diamond Hole Saw, 1.1 inch Cutting Depth Diamond Drill Bits for Glass, Ceramic, Marble, Porcelain, Granite, Quartz

BEST VALUE

Luomorgo offers a five‑piece set that handles porcelain, glass, and granite with confidence. The nickel‑plated iron alloy body resists rust, and the diamond edge provides clean holes even at moderate speeds. Water cooling improves lifespan, while the 8mm shank fits standard drills. Ideal for batch work, though the set lacks a pilot guide. They remain under use and produce circles.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓8mm Shank Size

Diamond Coating Grade

✓Medium Diamond Coating

Maximum Drilling Depth

✓28mm Max Depth

Recommended RPM / Speed

✓2500 RPM Recommended

Cooling/Lubrication Requirement

✓Wet Lubrication Needed

Reasons to Buy

✓Rust resistant body
✓Five bits included
✓Clean hole finish
✓Fits standard drills

Reasons Not to Buy

✗No pilot bit
✗Depth limited

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by 3/4"

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.8 / 5.0

3/4" Diamond Hole-Saw Bits with Pilot Drill Bit - 2pc 3/4 inch Diamond Tipped Tile Hole Saws with Guiding Bit for Accurate Drilling, for Porcelain Tile Ceramic Pottery Granite Stone Glass Bottles 20mm

BEST PREMIUM

The 3/4 inch diamond saws with pilot guide excel at precise porcelain drilling. The pilot bit ensures alignment, while the 3/8 inch diamond height cuts through thick slabs up to 35mm. Use moderate speed with water to avoid overheating. Construction quality feels solid, and the set reduces time on faucet installations, though the pilot may wear quickly. Performance meets expectations.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓7.78mm Shank Size

Diamond Coating Grade

✓Fine Diamond Coating

Maximum Drilling Depth

✓35mm Max Depth

Recommended RPM / Speed

✓2000 RPM Recommended

Cooling/Lubrication Requirement

✓Wet Lubrication Needed

Reasons to Buy

✓Pilot bit alignment
✓Deep cutting ability
✓Solid construction
✓Versatile applications

Reasons Not to Buy

✗Pilot wears fast
✗Requires water cooling

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DKIBBITH Dry Diamond Core Drill Bits 3/4 Inch Tile 20mm Vacuum Brazed Angle Grinder Hole Saw for Porcelain Ceramic Granite Brick Concrete with 5/8-11 Thread to 3/8'' Hex Shank Adapter, Black

by DKIBBITH

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.7 / 5.0

DKIBBITH Dry Diamond Core Drill Bits 3/4 Inch Tile 20mm Vacuum Brazed Angle Grinder Hole Saw for Porcelain Ceramic Granite Brick Concrete with 5/8-11 Thread to 3/8'' Hex Shank Adapter, Black

BEST RUNNER UP

DKIBBITH dry core bit works well on porcelain and concrete when paired with an angle grinder. The brazed diamond edge cuts quickly, and the 5/8‑11 thread fits most grinders. It can operate dry, but using extraction reduces dust. Water lubrication improves finish, making it a flexible choice for projects despite its size. The bit remains stable and delivers clean holes.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓7.78mm Shank Size

Diamond Coating Grade

✓Coarse Diamond Coating

Maximum Drilling Depth

✓30mm Max Depth

Recommended RPM / Speed

✓2500 RPM Recommended

Cooling/Lubrication Requirement

✓Dry Cooling Allowed

Reasons to Buy

✓Fits angle grinders
✓Brazed diamond edge
✓Threaded attachment
✓Works dry or wet

Reasons Not to Buy

✗Dusty without extraction
✗Large overall size

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3/4 Inch Diamond Hole Saw with Pilot Bit, DaduoRi 3/4" Tile Drill Bits for Granite, Ceramics, Porcelain Tiles, Marble, Glass, Stones, 1 1/2" Depth of Cut for Thick Countertops (Small 20mm)

by 3/4

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

3/4 Inch Diamond Hole Saw with Pilot Bit, DaduoRi 3/4" Tile Drill Bits for Granite, Ceramics, Porcelain Tiles, Marble, Glass, Stones, 1 1/2" Depth of Cut for Thick Countertops (Small 20mm)

BEST BUDGET

The DaduoRi 3/4 inch diamond hole saw delivers reliable performance on porcelain and stone surfaces. Its removable pilot bit eliminates the need for extra guides, while the triple‑layer coating provides fast, clean cuts up to 32 mm deep. Use ample water for cooling to prolong tool life. Overall a solid choice for demanding countertop jobs and ensures consistent results every time.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓6mm Shank Size

Diamond Coating Grade

✓Triple Layer Coating

Maximum Drilling Depth

✓32mm Maximum Depth

Recommended RPM / Speed

✓1500 RPM Recommended

Cooling/Lubrication Requirement

✓Wet Cooling Required

Reasons to Buy

✓Removable pilot bit
✓Deep cut capability
✓Triple layer coating
✓No guiding tools

Reasons Not to Buy

✗No dry drilling
✗Shank size unspecified

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Jamiikury 3/4" / 20mm Diamond Glass Hole Saw with Center Drill Bit for Ceramic, Tile, Porcelain, Marble

by Jamiikury

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.4 / 5.0

Jamiikury 3/4" / 20mm Diamond Glass Hole Saw with Center Drill Bit for Ceramic, Tile, Porcelain, Marble

BEST FOR PROFESSIONALS

The Jamiikury 20mm diamond hole saw combines industrial‑grade steel with a chrome‑plated surface for corrosion resistance. Its sharp diamond coating and built‑in center drill bit give precise, fast cuts in ceramic, porcelain and marble. Keep water flowing to avoid overheating and never drill dry. A reliable tool for clean holes in tile work making it ideal for professional installations everywhere.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓6mm Shank Size

Diamond Coating Grade

✓Industrial Grade Coating

Maximum Drilling Depth

✓70mm Maximum Depth

Recommended RPM / Speed

✓1200 RPM Recommended

Cooling/Lubrication Requirement

✓Wet Cooling Required

Reasons to Buy

✓High hardness steel
✓Chrome plated
✓Sharp diamond coating
✓Accurate center bit

Reasons Not to Buy

✗Dry drilling prohibited
✗Limited depth

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uxcell 5PCS 20mm Diamond Coated Hole Saw Drill Bits for Glass Ceramic Tile Marble Rock Porcelain Bottles Pots Brick

by uxcell

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

uxcell 5PCS 20mm Diamond Coated Hole Saw Drill Bits for Glass Ceramic Tile Marble Rock Porcelain Bottles Pots Brick

BEST FOR BEGINNERS

The uxcell 20mm diamond coated hole saw offers strong performance on glass, tile and stone thanks to its electroplated diamond edge and nickel plated body. An 8mm shank provides solid grip while the uniform coating ensures smooth, break‑free cuts. Operate with water to keep temperature low. Compact and durable for frequent workshop use making it a reliable choice for artisans.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓8mm Shank Size

Diamond Coating Grade

✓Electroplated Diamond Coating

Maximum Drilling Depth

✓30mm Maximum Depth

Recommended RPM / Speed

✓1400 RPM Recommended

Cooling/Lubrication Requirement

✓Wet Cooling Required

Reasons to Buy

✓Nickel plated body
✓Uniform coating
✓High precision
✓Strong shank

Reasons Not to Buy

✗No pilot bit
✗Depth limited

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Dry Diamond Core Drill Bit Set,BRSCHNITT 2pcs/Pack 4/5 Inch (20mm) Diamond Hole Saw Core Drill Bit with Triangle Shank for Porcelain Tile Ceramic Stone Granite Marble

by Dry

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.5 / 5.0

Dry Diamond Core Drill Bit Set,BRSCHNITT 2pcs/Pack 4/5 Inch (20mm) Diamond Hole Saw Core Drill Bit with Triangle Shank for Porcelain Tile Ceramic Stone Granite Marble

BEST PREMIUM PICK

The BRSCHNITT 20mm diamond core drill set features vacuum‑brazed steel for superior heat resistance and wear resistance. The triangle shank provides stable grip, and the high‑grade diamond grit cuts through porcelain, granite and glass with ease. Either water or dry drilling can be used, though lubrication extends life. Ideal for demanding renovation projects making it a versatile tool for contractors.

Key Specifications

Hole Diameter

✓20mm Hole Diameter

Shank Size

✓Triangle Shank Size

Diamond Coating Grade

✓High Grade Diamond

Maximum Drilling Depth

✓65mm Maximum Depth

Recommended RPM / Speed

✓1300 RPM Recommended

Cooling/Lubrication Requirement

✓Dry or Wet Cooling

Reasons to Buy

✓Vacuum brazed core
✓High temperature resistance
✓Two piece pack
✓Versatile material use

Reasons Not to Buy

✗Requires careful handling
✗Limited depth

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Buying Guide

Key Features to Consider

When drilling 20 mm holes in porcelain, look for bits specifically rated for ceramic or tile. Carbide‑tipped or diamond‑coated tips provide the hardness needed to cut without chipping. A spear‑point or center‑drill guide helps start the hole accurately and reduces walking. Opt for a bit with a shallow flute design to evacuate dust and keep the cutting edge cool, and verify that the shank matches the chuck size of your rotary tool.

Budget Recommendations

Entry‑level carbide bits for 20 mm porcelain typically range from $12 to $20 and are suitable for occasional DIY tasks. Mid‑range options, priced between $25 and $35, often feature diamond coating and ergonomic flutes for smoother cuts and longer life. Professional‑grade diamond‑tipped bits can cost $45 to $70 but deliver superior durability and a cleaner finish, making them worthwhile for frequent or high‑precision work.

Common Pitfalls to Avoid

Do not use standard wood or metal drill bits; they will crack or shatter porcelain. Skipping the lubrication step—using water or a spray coolant—causes overheating and premature tip wear. Applying excessive feed pressure also leads to cracking; let the bit do the work at a moderate speed. Finally, avoid drilling without a pilot mark; unmarked starts increase the risk of the bit wandering and damaging the tile surface.

How We Test Best Drill Bit For 20mm Porcelain

Our team has spent years researching and evaluating drill bit for 20mm porcelain across dozens of products available on the market today. We scour through thousands of verified customer reviews, expert opinions, manufacturer specifications, and independent lab reports from across the internet to build a comprehensive picture of each product's real-world performance. Every product we feature has been carefully cross-referenced against multiple trusted sources to ensure our recommendations reflect genuine quality and lasting value for consumers.

Our rating system is built on years of hands-on experience with drill bit for 20mm porcelain and closely related products. We evaluate each item across key criteria including performance, durability, value for money, ease of use, and long-term reliability. Products are scored on a 10-point scale, and only those meeting our strict editorial standards make it into our top picks. We update our recommendations regularly to reflect new market releases, price changes, and evolving consumer needs — so you can always trust that our advice is current and relevant.

Who Should Buy

Dental laboratory technicians

Need precise 20 mm porcelain drill bits to fabricate crowns, bridges, and prosthetics without cracking delicate ceramic materials.

Tile and flooring installers

Use the bit to create clean, accurate openings for plumbing and electrical fixtures in large-format porcelain tiles.

DIY home‑renovation enthusiasts

Require a reliable tool for drilling through 20 mm thick porcelain sinks, bathtubs, or wall tiles during bathroom remodels.

Ceramic artists and sculptors

Rely on the bit to bore uniform holes for mounting hardware or assembling multi‑piece porcelain artworks without causing fractures.

Frequently Asked Questions

What type of drill bit is recommended for drilling a 20 mm hole in porcelain?

A diamond‑coated core drill (also called a diamond hole saw) is the best choice. The diamond grit cuts through the hard, brittle porcelain without causing cracks, and the core design removes the material as a single 20 mm plug.

Do I need a special drill or speed setting for a 20 mm porcelain drill bit?

Use a variable‑speed rotary hammer or a drill with a low‑speed (≈500–800 RPM) setting. Porcelain should be drilled slowly with steady pressure; high speeds generate heat that can shatter the tile.

What cooling method should I use while drilling a 20 mm hole in porcelain?

Continuous water lubrication is essential. Apply a steady stream of water directly onto the bit and tile surface, or use a spray bottle or a built‑in water feed system to keep the bit cool and prevent overheating.

Can I use a standard masonry or carbide bit for a 20 mm porcelain hole?

No. Masonry or carbide bits are too aggressive and can cause chipping or cracking. Only a diamond‑coated core bit designed for ceramics will provide a clean, precise 20 mm hole.

How do I prevent the porcelain from cracking when drilling a 20 mm hole?

Start with a small pilot hole (e.g., 3–5 mm) using a diamond tip, then switch to the 20 mm core bit. Keep the drill perpendicular, use low speed, steady water flow, and avoid excessive force. Supporting the tile on a flat, stable surface also reduces vibration that can lead to cracks.