3'' Copper Resin Wet Polishing PucksThese copper bond diamond tools offer outstanding results on concrete as the initial grinding steps, especially on concrete polishing projects! They offer fast and aggressive cutting with a smooth scratch pattern. Transitional tooling between metal and resin tooling Work great with all machine sizes, including grinders, polishers, and swing machines 3 inch diameter; velcro backed; 50, 100, 200, 400, and 800 grit Sold in 9 Piece Sets