4. not easy to rust, wear , long service life. 1. Product use: By connecting the taper hole drill chuck, so as to connect with the machine tool, and the flat position is convenient for disassembly from the machine tool. 2. High concentricity when working with the corresponding drill chuck. 3. Can be adapted to a variety of drilling machines, milling machines,lathes and so on. 5. Professional designed, beautiful appearance, easy to use., Weight: 0.63382900325 Pounds, Manufacturer: Ehwisbe