Electroplated Diamond Core Drill Shank: Hexagon or round Grit:#40 Dia: 6mm-128mm ... .The main products are as follows:Electroplate Diamond Discs,Diamond Core Hole Drills,Diamond Needle Files and Resin-Bond Diamond and CBN ... our products,you can contact with me directly NameElectroplated Diamond Core DrillShankHexagon or roundGrit#40Dia6mm-128mmColorgreenApplicationglass,ceramic,granite,marble,tile stone ...