Fundamental Rockhound Products: Diamond Hand Pad 3500 grit for Grinding, Polishing, Smoothing Sharp Edges in Glass or Stone or Crystals Professional Diamond Coated Hand Pad 95mm x 55mm Used for grinding, shaping, and polishing cut edges of glass or stone Use wet or dry, ideal for flat surfaces - LASTS LONGER when used with lubricant (oil or water) 3500 finest grit, Foam Backed 28mm