Heavy duty variable pitch holesaw. Bi-metal construction. Hardened HSS teeth, flexible high carbon steel backing for fast clean cut. For cast iron, stainless and structural steel, alloyed and non-alloyed aluminium, bronze, copper, PVC, acrylic and wood. Heavy duty variable pitch holesaw. Bi-metal construction. Hardened HSS teeth, flexible high carbon steel backing for fast clean cut. For cast iron, stainless and structural steel, alloyed and non-alloyed aluminium, bronze, copper, PVC, acrylic and wood.