diamond grinding disc: 1.Size:100mm 2.Hole size:16mm,20mm 3.Usage:cut and polish granite,marble,glass,concrete,ceramic,til diamond grinding disc1 ... ) Hole size: 16mm,20mm,special hole size is accepted.2. Diamond grit: 40 - 120 available.3. Coating: nickel, chrome, ... surface, high cutting speed.5. Cutting and grinding. 6.Usage: Suitable for cutting various hard Non-ferrous materials, such as marble, ...