diamond disc: 1.Size:100mm 2.Hole size:16mm,20mm 3.Usage:cut and polish granite,marble,glass,concrete,ceramic,til diamond disc1.Dimensions ... ) Hole size: 16mm,20mm,special hole size is accepted.2. Diamond grit: 40 - 120 available.3. Coating: nickel, chrome, titanium available ... as marble, granite, glass, ceramic,hard tile, concrete and brick. 7.If you have special requirement, we also can do according ...