THK ® Diamond Lapidary and Jewelry Grinding wheel. Our products are in use at many of the larger projects such as the HK airport and HK Disney Land. Grit : 46 (coarsest) to 3000 (finest). We have Grit 46, 60, 80, 100, 150, 240, 320, 400, 600, 800, 1200, 1500 & 3000 available.