? High concentric running exactness through solid construction.? CAD-optimized cutting angles with specially ground section ensureshigh cutting capacity and long tool life.? Quick removal of drilled core through ejector spring for all hole sawsup to 150 mm (5-29/32") Ø.? Carbide tipping enables repeated re-grinding.? ALFRA hole saws are repairable. In the event of a tooth breaking,it can easily be replaced and resharpened.? Exchangeable center pin.? Use of MT tool holders from Ø 31 mm (1-7/32").? For use on hand drilling machines(recommended up to max. Ø 40 mm; 1-9/16”) or stationary machines.