WHAT YOU GET: 1 x Aluminum case, 1 x 5-13mm, 1 x 3-13mm, 1 x 6-19mm, 1 x 5-22mm, 6-35mm drill bits steps, 1 x automatic center punch and 1 x twist drill. AUTOMATIC CENTER PUNCH: The automatic center punch provides an automatic, high-impact, spring-loaded strike on the cap; Its brass body has a deep, knurled surface for non-slip control. The protective casealuminum can provide convenient storage and transportation. DUAL CUTTING BLADES AND THREE-SIDED SHAFT: Double cutting blades and X-type opening design ensure faster and smoother cutting; 3-sided shank design can prevent the drill chuck from slipping; With the mostsmall pressure, sets can cut through wood, sheet metal, steel and other surfaces. HSS AND TITANIUM COATED: High speed steel makes the step drill bit set more durable, titanium coating can easily cut steel plate, aluminum plate, copper, plastic and metal wood and many other types of sheet metal. TIME SAVING: Covering assorted pitch sizes makes it possible to drill or enlarge different holes in one drill bit without constantly switching drill bits. The size is laser etched into the metal, so it can be precision drilled and will not wear offnot even if used for a long time. Benefits: 1. Use twist drill bit: pre-drilling by stepping drilling, reduce the damage to the drilling workpiece during drilling. 2. CNC machine tools, each process is strictly controlled and each step of quality control. 3. Compared with the twist drill, the step drill is not easy to break and can cut different hole sizes. Features Double-cut blade design allows for faster, smoother cutting High speed steel for longer life Quick change HEX handle for easy attachment. A drill bit can drill holes of different sizes Two flute design: The chip removal ability is better and the drilling speed is accelerated. Improve your productivity. Design of X-type openings to facilitate the disposal of cutting waste during drilling. Attractive and practical design home improvement and general building monitoring/technology. The exquisite aluminum package box picks up the drill bit and provides the necessary set. Long live The centering punch is made of high-impact alloy steel for easy positioning before drilling and breaking glass. Positioning and pre-drilling to protect the conical bit.