SHAANXI ZUANLONG DRILLING MACHINE CO., LTD, established in 2000, with registered capital of RMB 20 million, is a hi-tech enterprise dedicating to PDC drill bit manufacturing field more than ten years. We are professional manufacturer in PDC drill bit R&D, manufacturing as well as marketing and service. The company is professionally produce all kinds of PDC drill bits, diamond drill bits, drill pipes and other diamond tools as per the customers' request. All of the products under control of the ISO9001:9002 system and some of them obtained national patent.We set up the principle of...