HSS bi-metal hole saw, Ø 48mm. These hole saws are made of bi-metal with hardened teeth crafted from high-alloy high-speed steel containing 8% cobalt, which significantly increases tool life. They offer faster and smoother cutting due to a new type of teeth with an irregular shape and pitch, resulting in less vibration. Optimized for use in cast steel, grey cast iron, stainless steel, structural steel, aluminum, 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. Only use hole saws with the appropriate mounting shank and center drill.