... bits, Coupling, Shank Adaptors, DTH Bits and hammer. Shandong Sanshan Group Co., Ltd. ("SSG") was established in 2003. It consists of ... Rock Drill Steel Co., Ltd., Yanggu Sanshan Renewable Resource Recycle Co., Ltd. and Yanggu Sanshan Natural Gas Co., Ltd. Our Group company's ... patents. Many of our products are at an advanced international level. SSG has been awarded as "Shandong Provincial Famous ...