STADEA Grit 400 4" Diamond Polishing Pads Premium Grade Wet Flexible 3 MM High Stadea wet diamond polishing pads series Standard A, 4 inch diamond impregnated resin bonded pads designed for wet concrete polishing, wet marble polishing, wet travertine terrazzo polishing, wet granite polishing wet diamond polishing pad, 1 piece for grit 400 Velcro backed polishing pads for easy connect and removal, with water hole in center, Color coded velcro backers to easily identify polishing pads grit Outstanding shine for concrete polishing, ideal for concrete countertop polishing, concrete floor polishing. Good shine for granite edge polishing, marble terrazzo travertine and other stone flat or contoured surface polishing Works great with concrete stone wet polishers, 2.2 mm thick polishing pads, maximum RPM 4500, Optimal RPM 2200; Available in individual grits or sets