Hebei Zhongcheng Drill Bit Manufacture Co.LTD .(SRF) was established in 1997. It is a privately owned and proudly company. We have grown to become a leading manufacturer of tricone bit and supplier of high quality drilling tools & equipment, and we excel in designing, manufacturing, and distributing construction industry drilling tools as well as finding custom solutions to complex problems. Our goal is to provide our customers with the best quality tools, accessories and service in the industry. We are supported by many years of experience, trained professionals and a full machine shop. Hejian Zhongcheng Bit Manufacture Co.LTD, our brand “SRF” maintains a strong reputation in the construction, exploration, water well, geothermal, mining, and oil & gas industries as a company that can provide dependability and high quality products at excellent value.