Cangzhou Great Drill Co., Ltd is a company with professional designers ,which  specializes in drill bits, tricone bits, pdc bits bit size range from 3 7/8"to 26", cover most of IADC codes. Besides, Our products like Drill pipe, Mud pump and stabilizers for water well, oil field, construction, geothermal, directional boring, and underground foundation work all over the world. The mission statement of our company  is to sell the best quality products at the most reasonable  price. We are a professional supplier of new and used (rebuilt) drill bits used for oil filed, water well. Including tricone bits, PDC bits and drill pipe. Various of model and dimension available. Good conditions and reasonable price. If you find any chance to work together with us, please contact me It's my pleasure to service for you .