Xinsheng Technology Development Co., Limited is a professional supplier of rock drilling tools in China. Main Products:Taper Rock Drill Tools- 7, 11,12 degree- Chisel Bit- Button Bit-Cross Bit-Taper RodThread Rock Drill Tools: -R28, R32,R38, T38, T45, T51- Button Bit-Drill Rod-MF-ROD-Coupling