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Silver cylindrical drill bit with carbide spear tip on plain background

Tuff Stuff

Tuff Stuff PTAGTB420 Glass & Tile Drill Bit 5/16" X 2-7/8

SKU CH-NM3N-ZWQ60

Carbide-tipped PTAGTB420 bit drills clean holes in glass, ceramic and marble tile without chipping at 5/16" by 2-7/8"

  • Product typeDrill Bits
  • Main materialGlass & Tile
  • Sold asEach
  • Tungsten carbide spear points cut clean holes without chipping glass or tile
  • Designed for rotation-only drilling on ceramic and marble surfaces
  • Slow drilling speeds recommended for precise results in brittle materials
  • 5/16 inch diameter suits common tile installation tasks
  • Carbide tip maintains sharpness through repeated use on hard surfaces

Tuff Stuff PTAGTB420 Glass & Tile Bit

The Tuff Stuff PTAGTB420 is a carbide-tipped drill bit designed for clean holes in glass, ceramic and marble tile. Tungsten carbide spear points cut round openings without chipping or breaking the material. It is built for rotation-only drilling and suits both DIYers and trade professionals.

Check drill compatibility before ordering

Ensure your drill or driver accepts a 5/16" shank and can run at slow speeds without hammer action. The bit is for rotation only and must not be used in percussion or hammer mode. Verify the chuck grips the shank securely and that you can control a low RPM for best results.

Suits tile and glass installers needing clean holes

Ideal for fitting fixtures, brackets or pipework through hard, brittle surfaces where chipping must be avoided. Not for buyers who need a percussion-rated bit for masonry or concrete, or anyone requiring a larger diameter than the 5/16" size this bit provides.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 93% of the 5,493 comparable items (median $27.99).

Specifications

Product
Product typeDrill Bits
Size & build
Main materialGlass & Tile

Questions about this item

Does the 5/16" carbide-tipped bit come alone or in a set?

The Tuff Stuff PTAGTB420 is sold as a single drill bit; no extra bits, guides or lubricants are included in the package.

When should I choose the 5/16" size instead of a different diameter?

Select the 5/16" bit when the anchor, fastener or pipe you are installing requires a 5/16" hole in glass, ceramic or marble tile.

How does the carbide spear point behave in hard tile?

The tungsten carbide spear point cuts clean, round holes in glass, ceramic and marble without chipping when used at slow speeds in rotation-only mode.

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