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Glass Drill Bit

Drill Bits for Glass Buying Guide

Glass can prove one of the more difficult areas of any construction project. It’s combines strength, hardness and a variety of quirks into one substance. However, the best drill bits for glass can turn a difficult project into an easy one.

Luckily, there are drill bits that exist to specifically handle glass. You can drill holes into glass and find next to no noticeable cracks left behind. These drill bits are greatly appreciated by home builders, product manufacturers, remodelers and other construction-oriented personnel. They spare these workers the trouble of having to resort to contacting a personal welder to have holes blow-torched into glass.

How To Drill a Hole in Glass

  • Step 1: Make an “X” with two pieces of painter’s or masking tape at the drill site. In the center of the “X,” use a felt-tip marker to indicate the precise spot where the hole will be. The tape will give your bit some traction and keep it from wandering on the otherwise slippery glass surface.
  • Step 2: Secure the glass object you’re working with. Lay panes of glass on a pad or other cushioning material. If you’re drilling into a glass bottle and find it easier to work on the object at a slight angle—say, 45 degrees—place the bottle on its side, with the marked drill site facing up, lift by the neck to the angle that feels comfortable and hold the neck to keep it from moving while you drill with the other hand.
  • Step 3: Insert a 1/8-inch or 3/32-inch carbide- or diamond-tipped bit into the chuck of a variable-speed drill. Small bits work best for creating a dimple or starter hole in the glass. Don your protective goggles and hold the drill at a right angle (90 degrees) to the glass surface. Begin drilling at a low speed—below 400 rpm—to carve the starter hole; remove the tape when that’s done.
  • Step 4: Replace the starter bit with a larger one if your project calls for a wider hole. Continue drilling at about 400 rpm, and apply light pressure on the drill so you won’t crack the glass. High-speed drilling causes overheating and glass-powder buildup at the drill site; it can also ruin the bit.
  • Step 5: While the entry hole will be generally clean and smooth, the edges of the exit hole might be sharp. Gently file down any chips or jaggedness with a 600-grit diamond file that fits into the hole. Rinse to remove all residual dust.


What should the right drill bit be made out of?

Drills bits that properly cut glass without it cracking or shattering are made of tungsten carbide, diamond or have diamond coating. All other drill bits are better made for materials such as wood, plastic and masonry. Selecting the right drill bit material is important because you want a drill bit that will harm the glass as little as possible.

How fast should I drill?

Start with 700-800 RPM (Revolution per Minutes) and increase it gradually up to 2500-5000 RPM for a round-shaped bit. For core, diamond bits use sloe speed as fast drilling may produce excessive heat due to friction and may lead to burning or even cane fuse the glass you are drilling.

How long will the glass drill bit last?

It all depends on the skill of the person using it. Normally, you will get 70-100 holes, but you will get 1-5 holes only if the materials are tough and abrasive.

Are these better than a hole saw?

Yes, you can say. As these drill bits provide you a cleaner and smooth surface and also including the slugs being pulled out.