Features: 1. Unique stepped structure: one drill bit can open various sizes of apertures, and one step drill can reach a box of drill bits. 2. Convenient and easy to use: no need to use a center punch, and it is not easy to break compared with ordinary twist drills. 3. Wide range of applications: deburring, chamfering, reaming, and functions that cannot be accomplished by twist drills are made possible. 4. Made of high quality metal, suitable for punching holes in various materials, including steel brass, wood, plastic, etc. 5. Titanium coating to reduce friction and heat: heat treated and highly polished. Drill perfect round holes in steel, brass, plastic, wood, and more. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Size: As shown includes: 1 set x Step Drill Bit