A revolutionary diamond polishing system to replace conventional silicon carbide abrasives on natural stone and engineered stone. Designed for DRY and WET use. Grinds and polishes faster than sandpaper. Grinds more precise and flat. The quality of gloss and finsih is achieved easier and faster. Outperforms sandpaper at every grit size. More importantly SDA gives lower process costs than convential abrasive pads. Works on many materials granite, marble , composites, glass and engineered stone. Use wet on Engineered stone. Can be used dry on natural stones. Replace your sandpaper today and save time and money. Recommended speed 2000-4000 rpm on hand machines.