... , normal hardness ceramic,tiles, concrete wall with alloy base and carbide tipped pilot drill in kits.Max cutting depth ... 1134-1/265mm(2-9/16”)Overall LengthZinc Alloy Base to fit hole saw33,43,53,63,67, ... 53,63,67,73,83mm with hex screwAl Alloy Base to fit hole saw 73,83,93,103, ... 103mm with hex screwCarbide Tipped Arbor Drill Diameter 9.5mm x Overall length 135mm with hex shankCarbide Tipped Arbor Drill ...