【Convenience】 Staged drilling allows you to cut multiple hole holes with one drill bit, without constantly changing drill bits. 【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 coated titanium】 Made of super strong HSS steel and titanium coated, titanium coating ensures easy cutting steel, aluminum sheet , brass, copper, plastic, wood etc. 【Hex Shank】 The 6.35mm hex shank works with most drill bits or drills with a 6.35mm (1/4 "), adapts perfectly to power tools and eliminates slippage. 【Application】 Suitable for sheet metal, sink, car repair, etc. Widely used for cutting holes in a variety of materials such as plate, aluminum, insulation board, pvc board, wood thickness within 5mm. Finish: titanium Type: Step Drill Bit Head Type: Hexagon Shank Quantity: 3PCS Material: High speed steel Surface treatment: Titanium Coated Color: as picture show Package Include: 1X Set (3pcs) Step Drill with Nylon Bag Note: It does not include other things, The color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!