Electroplated Diamond Core Drill Shank: Hexagon or round Grit:#100 Dia: 6mm-128mm Jiangyin ... products,you can contact with me directly NameElectroplated Diamond Core Drill With A Center BitShankHexagon or roundGrit#100Dia6mm-128mmApplication glass,ceramic ... ,granite,marble,tile stone Electroplated Diamond Core Drill With A Center Bit(for granite )