【Convenience】Step drilling allows you to cut multiple hole holes with one drill bit, without constantly changing the drill bit. 【Two-Flute Spiral Groove Design】Allows faster, more stable and smoother cutting. It can automatically chamfer the hole to clean the drill bit. 【HSS and titanium coated】Made of super strong HSS steel and titanium coated, the titanium coating ensures easy cutting steel, sheet aluminum, brass, copper, plastic, metal. wood etc. 【Hex Shank】The 6.35mm hex shank works with most drill bits or drill bits with a 6.35mm (1/4) chuck, perfectly fits power tools and eliminates the sliding. 【Application】Suitable for sheet metal, sink, car repair, etc. Widely used to cut holes in a variety of material like plate, aluminum, insulation board, PVC board, wood thickness within 5mm.