Specification: Diameter 100MM / 4", Workable thickness 3MM, Inner dia 15MM-16MM Available Grits: #50, #100, #200, #400, #800, #1500, #3000 Application: Suitable for stones, granite marble travertine, basalt, artificial stone, terrazzo floor. Grind or polish from coarse to fine. Feature: 1. Wet Grinding or polishing with water feeding. 2. High quality industrial diamond powder mixed with resin bond provide high efficiency working and long life. 3. Pads backed with nylon cloth to meet different needs of hand grinding machine, floor renovation machine, ceramic polishing machine.