... -113Alloy Base and arbor drill Item Number Descriptions HSC1022-01Zinc Alloy Base to fit hole cutter 33,43,53,63,67 ... ,73,83mm diameters with hex screw HSC1022-02 Al Alloy Base to fit hole cutter 33,43,53,63,67 ... ,73,83mm diameters with hex screw HSC1022-03Al Alloy Base to fit hole cutter 73,83,93,103,113mm ... , Diameter 9.5mm x Overall Length 135mm with hex shank Tungsten Grit Tipped Hole Cutter