Stonecraft - 4" inch Diamond Polishing Metal Bond Pads Wet/Dry 11 Piece Set with White Buff + Backed Pad for Granite Marble Concrete (White) Professional quality 4 inch Diamond Pads set for polishing marble, granite, concrete, terrazo, Engineered Stone, Limestone, Travertine, and Slate Our set includes 1 pc Metal Bond pads for each # 50, 100, 200, 400 and 1 pc Resin Bond pads for each # 600, 800, 1000, 2000, 3000, White BUFF and 1 Pc Velcro Rubber backing pad (5/8" arbor). Backer pad has water feed hole for wet polishing as well Stonecraft tools designed in Europe with defense industry know how in mind, that is why our pads are very flexible, and safe to use. They can be used for flat or convex, concave polishing Fast aggressive polishing, increased 50% life span. Polishing disc specifically designed to be used universally, dry or wet. The pads set work good for dry use, wet polishing would give better result