... , Coupling, Shank Adaptors, DTH Bits and hammer. Shandong Sanshan Group Co., Ltd. ("SSG") was established in 2003. It consists of ... Drill Steel Co., Ltd., Yanggu Sanshan Renewable Resource Recycle Co., Ltd. and Yanggu Sanshan Natural Gas Co., Ltd. Our Group company's ... and energy supply construction. Yanggu Sanshan Renewable Resource Recycle Co., Ltd. is mainly engaged in metal recycling. It provides ...