The Bahco Electrician's Bi-Metal Holesaw Set contains Sandflex(r) Bi-Metal holesaws, specially designed for metal cutting: ferrous metals (steel, stainless steel, cast iron) and non-ferrous metals (aluminium, brass, copper). They can also be used in most materials such as wood and plastics. Bi-metal construction with 8% cobalt for increased wear resistance. This 10 Piece Kit contains: 8 x Holesaws: 20, 25, 30, 35, 44, 51, 64 and 76mm 2 x Arbors