1.Quality Material: The step drill bit made of highspeed steel and titanium coating, the cutting edge can keep sharp to ensure the hardness of cutting. Titanium coating also increases wear resistance, reduces friction, heat resistance, corrosion resistance, rust resistance 2.Sizes: Including 5 standard step bits, can replace 50 individual drill bits, meet a wide range of needs, effectively eliminate the trouble of switching between multiple bits, can be flexibly used to improve work efficiency 3.Automatic Center Punch: Using a heavy duty spring loaded automatic center punch. Simply position it at the place where you intend to drill, and it will make a tiny indentation to keep the drill bit in position. 4.Special design: The unique double blade structure of step bit provides a smoother cutting experience and helps to quickly remove material particles generated during cutting. The 118° sharp Angle reduces friction and pressure during operation, making the step drill bit set longlasting and efficient 5.Widely Application: The step bit is ideal for drilling holes in metal, aluminum, iron etc. Not for hard metal, stainless steel. For different projects to provide a wide range of sizes. When drilling metal plates, it is recommended to add coolant or water cooling, and the speed should not be too high