Variable pitch holesaws in bi-metal construction. Hardened HSS teeth, flexible high carbon steel backing. For cast steel, malleable cast iron, stainless and structural steel, alloyed and non-alloyed aluminium, bronze, copper, PVC, acrylic and wood. Contains: 18, 20, 25, 32, 40 and 51mm holesaws. Includes 2 arbors and mandrel adaptor. Variable pitch holesaws in bi-metal construction. Hardened HSS teeth, flexible high carbon steel backing. For cast steel, malleable cast iron, stainless and structural steel, alloyed and non-alloyed aluminium, bronze, copper, PVC, acrylic and wood. Contains: 18, 20, 25, 32, 40 and 51mm holesaws. Includes 2 arbors and mandrel adaptor.