Jun 15, 2021 · Bi-metal construction, hardened HSS teeth and flexible high carbon steel backing. Used for working in cast steel, malleable cast iron, stainless steel, structural steel, alloyed and non-alloyed aluminium, bronze, copper, PVC, acrylic and wood. Contains 19, 22, 29, 38, 44 and 57mm holesaw and 2 arbors. Technical Specification. Brand. HSS. Colour.