This Starrett Holesaw Kit is ideal for cutting stainless and mild steel sheeting, plasterboard, wood and thin plastics. The holesaws are constructed from heat-resistant, hardened steel with constant pitch teeth for exceptionally smooth cuts. Completely assembled ready for use. A safety stop collar at the base of the holesaw prevents travel beyond the holesaw depth. Supplied in a plastic carry case with the following sizes: 20, 25 and 32mm.