Aanraku's Twofers Grinder Bits offer superior quality at a low-cost. The diamond abrasive grinding surface is double plated for strength, durability and long life. It's large 18mm bit height gives you a larger grinding surface, designed to maximize bite and allows for the uniform grinding. Diamond coating guaranteed not to peel! 

100-120 diamond mesh grit and 3/4" diameter. Use it to quickly and aggressively grind away at the glass. Bits fit most glass grinders.