... It consists of Shandong Rock Drilling Tools Co., Ltd., Wuyue Special & Rock Drill Steel Co., Ltd., Yanggu Sanshan Renewable Resource Recycle Co ... Sanshan Natural Gas Co., Ltd. Our Group company's products include steel, rock drilling tools and mining tools for scientific research, ... in 2005 was 600 million Yuan. Shandong Rock Drilling Tools Co., Ltd. is one of the biggest production bases of rock ...