Changsha Great Wall Drilling Tools Manufacturing Co.,Ltd. established in 2001. With almost 20 years of operation and development of this company, this company has got many technical experiences. These improve the quality and the technical content of our product and innovate our product constantly.This is the reason why our product are outstanding among all drilling tools manufacturers in China. Even some serise of our products of products are top product in this industry.Such as: Threaded Button Bits with Conical wedage Button. Our product mainly include high and middle air pressure DTH(Down The Hole) hammers and bits from 1.5"-12"(40mm-300mm) in diametes. Our products can perfectly match with the products of the world famous brand such as: Atlas Copco, Sandvik,Ingersoll-Rand and other well-know manufactures. They are widely applied to varies of areas including blast holes, earthwork projects,mineral exploration,water well,construction,bridge, geothermal exploration,etc.Our company has more than 10000 square meter modern workshop, many kinds of CNC machines,precision grinding machines,many kinds of heat treatment equipment and quality testing equipments.These increased the accuracy of the products and stability of the quality. At the same time,we have many senior technicians of this industry,they ensure the reliability of our products.