... bits, Coupling, Shank Adaptors, DTH Bits and hammer. Shandong Sanshan Group Co., Ltd. ("SSG") was established in 2003. It consists of ... Co., Ltd. and Yanggu Sanshan Natural Gas Co., Ltd. Our Group company's products include steel, rock drilling tools and mining tools ... national patents. Many of our products are at an advanced international level. SSG has been awarded as "Shandong Provincial Famous Brand ...