Perfect for , Concrete, Marble, Stone, Tiles etc. Aggressive and Durable made with quality Diamond Powder impregnated in Resin The backer/pad holder are with water feed hole, can be used for wet polishing. Diamond Polishing Pads 4 inch Wet/Dry 16 Piece Set Stone Concrete Marble Diameter: 4 inch (10cm) Color: color Material: resin + diamond Package Include: 3 X 50Girt Grinding sheet 3 X 100Girt Grinding sheet 2 X 200Girt Grinding sheet 2 X 400Girt Grinding sheet 2 X 800Girt Grinding sheet 1 X 3000Girt Grinding sheet 1 X 6000Girt Grinding sheet 1 X 10000Girt Grinding sheet Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.