Check the listing for details. Monster Vacuum Brazed Diamond Grinding Pads. Condition: New. Listed at 21.95 USD. The vacuum brazed diamond grinding pads combine the aggressiveness of vacuum brazed diamond cup wheels and smoothness of diamond polishing pads. Attached to a semi rigid back holder, rubber backer absorbs the noise and vibration created by steel based diamond cup wheels to give fabricators the smoothest feel, while aggressively shaping and removing material. They are ideal for creating a small radius by hand, smoothing out cuts, and removing materials where necessary. Many fabricators use it to replace the heavy grinding stones. They last many times longer than grinding stones and reduce fatigue. Use it before you use the diamond polishing pads.30 grit is more aggressive for granite, marble, glass, and other stones, even concreteVelcro backed for quick and easy change with back holdersOptimal speed around 4000-5000 RPM;Wet use preferred to extend life.