... polish granite,marble,glass,concrete,ceramic,tile et Diamond tools/diamond cutting Disc/Diamond BladeWe are able to supply various shapes and ... ) Hole size: 16mm,20mm,special hole size is accepted.2. Diamond grit: 40 - 120 available.3. Coating: nickel, chrome, ... 4. Own the automatic production lines of diamond tools;5. Keep the competition power in the market:the UnitedStates,Europe,Japan,Hongkong ...