General description This pack includes 12 pieces of 4 inch (100mm) diamond water grinding discs, featuring 11 wet diamond polishing pads and a backup pad. These discs are ideal for polishing various surfaces such as granite, concrete, marble, stone, and tile. Technical specifications Material: Resin impregnated diamond powder Grit: 3x50#+2x100#+200#+400#+800#+1500#+3000#+6000# Outer Diameter: 100mm (4 inches) Inner Diameter: 15mm (0.6 inches) Thickness: Approx. 3mm Usage Perfect for polishing granite, concrete, marble, stone, tile, and more. Polishes quickly and lasts for a long time. No color will remain on the stone after polishing. Other information Due to manual measurement, please allow an error of 1-3mm. Due to the difference between different monitors, the picture may not reflect the actual color of the item, please refer to the actual item.