【Automatic Center Punch】: Automatic center punch provides automatic, high-impact, spring-loaded impact on the cap; its brass body has a deep knurled surface for non-slip control. The aluminum protective case provides convenient storage and transportation . 【Double cutting blades and trilateral shafts】: Double cutting blades and X-shaped opening design ensure a smooth cut faster and smoother; 3-sided shank design prevents the drill chuck from slipping; with minimal pressure, the set can cut through wood, sheet metal, steel and other surfaces. 【HSS & TITANIUM COATING】: High speed steel makes the step drill bit set more durable, and the titanium coating can easily cut steel, aluminum, copper, plastic and wood and many other types of sheet metal. 【TIME SAVING】: Covering a variety of pitch sizes, you can drill or enlarge different holes on one bit without constantly changing the bit. The dimensions are laser etched into the metal so they can be drilled with precision and won't wear out even with prolonged use. 5-piece titanium coated core drill bit set, set of large step drill bits, HSS, spiral If you need a very satisfying stepper drill stop, this is what you need. The drill bit Stepped is made of HSS high speed steel, lined with titanium alloy and durable. Ideal for drilling holes in various materials such as steel, brass, wood, plastic, sheet metal, aluminum, insulation board, PVC board, etc. Widely used and concerned about: Compatible models, bench drill, hand drill, rechargeable drill. Tapered to drill larger, deeper holes, or widen openings in drilled areas. Knife blade design for faster cuts and automatic deburring when of the pe grinding. feature Dual cutting edge design for faster, smoother cuts High-speed steel for longer life Quick change HEX handle for easy installation. A drill can drill holes of different sizes advantage: 1. Use twist drill: Step drilling is used for pre-drilling to reduce damage to the drill piece during drilling. 2. CNC machine tools, each process is strictly controlled, and each step is subject to quality control. 3. Compared with twist drill bits, step drill bits are not easy to break and can drill holes of various sizes. Two-blade design: Better chip evacuation and drill more fast. Increase your productivity. X-shaped opening design for easy chip removal while drilling. Attractive and functional design Home improvement and general building monitoring/technology. An attractive aluminum box collects the drill and provides the necessary kit. longevity The centering punch is made of impact resistant alloy steel for easy positioning before drilling and break the glass. Position and pre-drill holes to protect tapered bits.