... Bits, Retrac Button Bits, Drifter Rod, Rock drilling tools, drilling bits, Coupling, Shank Adaptors, DTH Bits and ... was established in 2003. It consists of Shandong Rock Drilling Tools Co., Ltd., Wuyue Special & Rock Drill Steel ... Our Group company's products include steel, rock drilling tools and mining tools for scientific research, development, ... for business cooperation. coupling ROCK DRILLING TOOL