HSS bi-metal hole saw, Ø 140mm. These hole saws are made of bi-metal with hardened teeth crafted from high-alloy high-speed steel containing 8% cobalt, significantly enhancing tool life. They feature a new type of teeth with an irregular shape and pitch for faster and smoother cutting, resulting in reduced vibration. Optimized for use in cast steel, grey cast iron, stainless steel, structural steel, aluminium, bronze, copper, PVC, acrylic glass, wood, and more. The maximum cutting depth is approximately 35 mm. The thread for hole saws Ø 14-30 mm is 1/2"-20 UNF, and for hole saws Ø 32-152 mm, it is 5/8"-18 UNF. It is essential to use hole saws with the appropriate mounting shank and center drill.