4" diamond convex polishing pads kit - Hook And Loop Backing Pads Granite Stone Glass Marble Set By STADEA Professional grade 4" diamond convex polishing pads set of seven (7) pads & one (1) piece 4 inch convex hook and loop backing pads set by Stadea for granite marble stone concrete grinding polishing. The set comes with one polishing pads for grit 50, 100, 200, 400, 800, 1500, 3000. Premium quality velcro backed pads for quick and strong attach to backing pads ensure no slip or dislocation, no wobble Aggressive for faster polishing of stone surfaces, very effective for sanding grinding and polish of oval shape or hard to reach areas Works great for granite marble stone concrete glass concave convex surface grinding polishing Optimal RPM 1800 Max RPM 3000