HSS bi-metal hole saws 1. High speed steel M3 bi-metal cutting edge welded to chromium vanadium steel back for heavy duty cutting. 2. The welding extends through the M3 bi-metal line. 3. The 4-6 varied toothing ensures smoother cutting, less effort, less vibration and heat production during cutting and up to three times longer tool life. 4. Price without arbor, see Hole Saw Accessories 5. Follow Cutting Speed Information.
