Cangzhou Great PDC Drill bits Co., ltd specializes in designing, manufacturing, marketing and serving the high performance diamond bits and drilling tools used in petroleum industry .The company is established by the top experts of the field , and equipped with advanced equipments and facilities . Our diamond bits named Great , which ranging from 3"to 17-1/2", All the products have been awarded the ISO9001 certificate . Furthermore , the experienced and knowledgeable service team will ensure all the superior performance of our products in both the domestic and international market . With our service pursuit "Drilling requirement initially , Customer satisfaction finally ", we assure the products the best quality by adopting advanced design technology , manufacturing process and strict quality control .Our company will always improve and innovate to satisfy different needs for all users in the entire world . mike chen E-mail: ***** ***** QQ: 1946547249Mobile: 0086-13231768753