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. Its large 18mm bit height gives you a larger grinding surface, designed to maximize bite and allows for uniform grinding. Diamond coating guaranteed not to peel! 

100-120 diamond mesh grit and 1" diameter. Use standard coarse bits for the majority of your grinding jobs - it's a perfect medium between having quick grinding and a smooth finish. Bits fit most glass grinders.