Core drill bits :Suitble for cutting and drilling holes on various hard Non-ferrous. Materials,such as glass,marble,granite, l Diamond Core Drill Bitsl The overall length is 60mm, 65mm, 70mm, 100mml Suitable for cutting and drilling holes on various hard Non – ferrousl Materials such as glass ,marble,ceramic,granite and hard materials etc.Special design can be accepte Diamond Core drill bits