... Coupling, Shank Adaptors, DTH Bits and hammer. Shandong Sanshan Group Co., Ltd. ("SSG") was established in 2003. It consists of ... Co., Ltd., Wuyue Special & Rock Drill Steel Co., Ltd., Yanggu Sanshan Renewable Resource Recycle Co., Ltd. and Yanggu Sanshan Natural Gas Co., Ltd. Our Group ... for Wuyue Special and Rock Drill Steel Co., Ltd. Yanggu Sanshan Natural Co., Ltd. deals in the supply and trade ...