Consists of popular sizes within engineering industry, water and sanitation industry, electric installation industry.Sandflex® Bi-Metal holesaws are specially designed for Metal cutting but can be used in most materials such as wood and plastics.The holesaw cuts through ferrous metals (steel, stainless steel, cast iron) and non-ferrous metals (aluminium, brass, copper).Cutting depth max 38mm (1 1/2").4/6 teeth per inch.Arbors require a Power drill with 10mm chuck