General description 7Pcs Diamond Polishing Disc 4'/100mm Dry Diamond Polishing Pads are designed for effective dry polishing of various materials including granite, marble, tile, stone, and quartz. These flexible pads allow for polishing different shapes and provide a high-gloss finish, making them ideal for both professional and DIY use. Technical specifications Diameter: 100mm/4" Thickness: 3mm Workable Thickness: 1.5mm Available Grit: #50 Maximum RPM: 4000 rpm Recommended RPM: 2500 rpm Installation Must be used with polishing equipment such as polishers, angle grinders (high speed is not recommended), or hand sanders. Pads are reinforced with nylon materials for quick disc changes. Usage Dry polishing without water, which is convenient and less polluting. Wear appropriate protective gear including eye, nose, face, and hand protection during dry polishing. Other information Easy pad identification with color-coded nylon knob. Best value for money, very competitive.