... DTH Bits and hammer. Shandong Sanshan Group Co., Ltd. ("SSG") was established in 2003. It consists of Shandong Rock Drilling ... tools for scientific research, development, trading and metal recycling. SSG has been awarded as "National 863 Project Undertaking Unit", " ... Patent", "AAA Credit Enterprise", and "Shandong Province Credit Enterprise". SSG covers an area of 260000 square meters, with more than ...