Features: 1. Made of high quality chrome vanadium alloy steel, not easy to break and rust, reusable and durable. 2. The drill bit is well-made and the surface is smooth, which is convenient for drilling, improves the drilling speed and completes the work more efficiently. 3. Portable: Small size, easy to carry. Easy to store and doesnt take up too much space. 4. 33 chrome vanadium steel drill bits, enough to meet your daily and replacement needs. 5. Wide range of applications: The hollow drill bit can be used with confidence and has a wide range of applications. It is suitable for drilling of different materials such as glass, tile bottles, block jars, tiles, ceramics, slate, marble, granite, etc. 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: Material: Chrome vanadium alloy steel Packing: 65*45*30mm includes: 1 set x Bit Combination Kit