General description Diamond Polishing Disc set includes 15 pieces of 4-inch (100mm) diamond polishing pads designed for effective polishing of various surfaces. The set features a range of grit levels from 50 to 6000, making it suitable for both coarse and fine polishing tasks on materials such as granite, concrete, marble, stone, and tile. Technical specifications Package includes: 14pcs mix grit wet polishing pads (50#, 100#, 200#, 400#, 800#, 1500#, 3000#, 6000#) and 1pc hook and loop backing pad (5/8" hole x 11 threads) Material: Diamond powder and resin powder Diameter: 4 inches (100mm) Height: 3mm Optimal RPM: 2200 Maximum RPM: 12000 Usage These polishing pads can be used dry, but optimal results are achieved when used with water, enhancing the polishing efficiency and prolonging the life of the pads.