Diamond Polishing Pads Perfectly suited for all types of granite, marble, ceramics, and stone Hook and loop backed for quick use and changing 100mm dry pads. Inner hole size 17mm. Overall thickness 3.5mm >> Tooltechs line of Workbench Series 4in polishing pads are designed for the grinding and polishing of marble, granite, ceramics, and other stone materials. Designed to fit most hand grinders, they are available in multiple grits, ensuring the proper one is chosen for the task at hand. Pads are colour coded for quick grit identification and are hook and loop backed for rapid and effortless changing. These diamond pads are rated for high sharpness and are used dry.