HSS Titanium Drill Bit 12 – 60 mm Hole Saw Stainless Steel Metal Alloy Cutter. For stainless steel, iron plate, steel plate, aluminum alloy and all kinds of metal pipe opening operation Iron plate. Package: Transparent plastic box. Knife cutting material must be fixed, can not have moved, and the hole opener to 90 degrees at right angles. Start drilling slowly after contacting the material to be drilled, not to hit the workpiece, while applying low RPM (the larger the hole opener, the lower the RPM). When screwing up and down, please don’t use too much force to screw slip 4. If there is an abnormality or poor chip discharge, please stop working, clean up the iron chips and then work. Sharp teeth, small vibration, rapid balance when opening the hole, more stable operation. 6542 high-speed steel material, wear-resistant, high smoothness. Easy chip removal. Special hole design for chip removal, reasonable structure and rapid chip removal. Universal shank shape to prevent slippage and carry more torque.