HSS bi-metal hole saw, Ø 83mm. Bi-metal hole saws with hardened teeth made of high-alloy high-speed steel with 8% cobalt content, thus greatly increasing tool life. Faster and softer cutting due to new type of teeth with irregular tooth shape and pitch thus also less vibration. Optimized for use in cast steel and gray cast iron, stainless steel, structural steel, aluminum, bronze, copper, PVC, acrylic glass, wood.... Maximum cutting depth approx. 35 mm. Thread for hole saw Ø 14-30 mm: 1/2"-20 UNF Thread for hole saw Ø 32-152 mm: 5/8"-18 UNF. Use hole saws only with the appropriate arbor and center drill.