Changsha Tianhe Drilling Tools and Machinery Co.¼ŒLtd., which is located in Hanpu Scientific and Educational Park, Wangcheng County, Changsha, Hunan, China, has become a specializing plant producing various drilling tools for soil and rock excavation projects. It is also a member unit of the council of China Drill Steel and Drilling Tool Association. It was established in November, 2002. Up to now, the total area is 45,000 square meters. The annual value is 50,000,000yuan. The producing capacity is 80,000,000yuan. The value of the company is 30,000,000yuan. The technical value of more than half of the products is higher than other companies in the same line in China. It has a long-term close technical cooperation with Changsha Mine Research Institute, Centre South University, Zhuzhou Cemented Carbide Group Co., Ltd. and some other research and production units. The quality management system has passed the certification of ISO 9001:2000.At present, there are more than 110 people in the company. The technical team is composed of some technical personals devoting themselves to studying on the research and manufacture of drilling tools. Among them, eighteen people have the middle-class and high-class technical titles, covering majors of metal material, heat-treatment, powder metallurgy and machinery design. Besides, Li Zhaohe, who is drilling tools expert winning national technical allowance, is invited to be our technical consulter.There are four main series of products in our company: 1. Drilling tools with large diameter for deep hole and super deep hole drilling. 2.DTH hammers and their matched drilling bits under different working air pressure. 3. Concentric and eccentric reaming drilling tools followed by casing drilling. 4. Drilling tools and parts matched with rock drill under hydraulic pressure. Our DTH drilling tools have most of varieties and specifications in the same xxxxx application fields of our products have expanded from mine and hydroelectric e