MILWAUKEE SUPER-TOUGH BI-METAL BAND SAW BLADES Theses blades will out-last conventional blades up to three times, requiring fewer blade changes. Extremely hard and uniform tooth point is electron beam welded to a tough durable backing with high flex life for faster cutting. Recommended uses: high speed cutting of aluminum, angle iron, bronze opper, galvanized pipe, mild steel; and tougher steels including stainless, chrome, tungsten steels plus other problem material at slow speed.