15 piece bi-metallic hole saw set. •Ideal for use by industrial, plant maintenance and other professional users. •Cuts mild steel, copper, aluminium, brass, laminates, plastics and all timbers. •Bi-metal high speed construction for strength and durability. Set includes: •20, 22, 25, 32, 35, 38, 44, 51, 64, 70, 76 mm hole saws. •10 x 12 mm and 10 x 16mm arbours. •6 mm pilot drill. •10 inch arbour extension. •Ejector spring.