Cangzhou Great Drill Co., Ltd. specializes in designing, manufacturing and marketing high performance diamond bits and drilling tools which are used in petroleum industry. Our company was established by the top grade experts of the field and is equipped with advanced equipment and facilities. Our diamond bits are named as Great, with specifications ranging from 3" to 17-1/2". All our products have passed ISO9001 certification. Furthermore, our experienced and knowledgeable service team will ensure superior performance of our products in domestic and overseas markets. With our service pursuit of "Meeting drilling requirement initially, Customer satisfaction finally", we assure our products of the best quality by adopting advanced design technology, manufacturing process and strict quality control. Our company will always make improvement and innovation to satisfy different needs of users from all over the world.