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Draper Expert Cobalt Hole Saw Set (12 Piece). This variable pitch hole saw kit is manufactured from heavy-duty steel with 8% cobalt for extra strength and performance. Suitable for cutting holes in steel, brass, bronze, cast iron, aluminium, wood and plastics. Maximum cutting depth 38mm. Hole saw sizes 20, 22, 29, 35, 38, 44, 51, 57, 64mm (diameter). Kit includes 14-30mm and 32-152mm hex. arbors and 4mm hex. key. Supplied in a blow moulded plastic storage case.