Hole saws made of tough, shatter-proof, sturdy HSS bimetal for cost-effectively cutting out holes. The saw teeth are made of high-quality M42 (Co8) material. High concentricity. Chattering during sawing is prevented by alternating tooth pitch. This set contains nine sizes in the most common diameters used in the engineering field. Set contains: Hole Saws: 20, 22, 25, 32, 40, 44, 51, 57 & 64mm Arbors: 3/8″ hex shank, 1/4″ round shank Pilot drill: 6/90 (long) Adaptor
