Haojiang Drilling Service Co., Ltd (referred to as HJD BITS) formerly known as Shanghai First Petroleum Machinery Factory, was established in 1956 and was the first enterprise in China to produce tricone bits.At the request of Kingdream Drill Bits, Haojiang became an important cooperative manufacturer of Kingdream with its stable and reliable product quality.HJD BITS is mainly engaged in the research, development, production, and sales of various series of oil Roller Cone Bits and mining drill bits, with product specifications covering 3 7/8″-26″. With flexible market adaptation mechanism, HJD BITS can provide stable quality and reliable oil products to domestic and foreign customers in a timely manner, while also providing excellent pre-sales and after-sales services.HJD BITS’ products also sell well in Middle East Japan, Southeast Asia and North America, receiving high praise and favor from domestic and foreign customers. HJD BITS has built a flexible production line of drill bits mainly with CNC machining center, established a perfect quality assurance system, established a comprehensive quality assurance system, and passed ISO9001 and API 7-1 certifications.To know more details on our products, please kindly visit our website :www.hjdbits.com For enquiry and cooperation, please feel free to contact with us Email: howard@hjdbits.com