This is our new industrial variable speed wet polisher / grinder. This professional unit is equipped with a 800 watt 7 amp variable speed motor and features a variable speed dial for optimal control. You can operate from 700 -3,000 RPM. Optimal polishing results are achieved at 2500 RPM. Specialty Diamond E4SET Professional grade starter pad set for concrete, granite, and marble polishing (E4PADSET). Specialty Diamond E4SET 4" Diamond polishing pad set includes: 50, 100, 200, 400, 800, 1500, 3000 grit and also includes hook & loop backing pad. Specialty Diamond E5SET 5" Diamond Polishing Pad Set Includes: 50, 100, 200, 400, 800, 1500, 3000 Grit & Rubber Hook & Loop Backing Pad. Premium Specialty Diamond 5 inch diamond polishing pads have been manufactured with an advanced 3mm thick hard bond resin matrix to maximize life when used to grind and polish abrasive concrete surfaces.