Bi-metal hole saws: (x1) Ø22mm (x1) Ø29mm (x1) Ø35mm (x1) Ø44mm (x1) Ø51mm (x1) Ø64mm Adaptors: (x1) 3/8" Hex HSS adaptor Ø22-35mm (x1) 7/16" Hex HSS adaptor Ø44-64mm (x1) Hex key for replacing pilot drill bit (x1) Adaptor 1/2-20UNF - 5/8-18UNF The Bi-metal hole saw's fast cutting power lies behind its HSS (hi-speed steel) manufactured teeth. The teeth have been set to a variable pitch to improve harmonic vibration and to have a better chip clearance. The hole saw can be used to cut into: Aluminium Copper Mild steel (sheet metal) Stainless steel (sheet metal) Zinc Wood Drywall (plaster board) PVC