Cangzhou Great Drill Co.,Ltd specializes in drill bits,including Kingdream tricone bits, PDC bits whose size range from 3"to 27", cover most of IADC codes. Drill pipe, Mud pump and stabilizers and other drill equipmnet.We are a professional supplier of new and used(rebuilt) drill bits used for oil filed, water well.High quality with best price is our advantage. If you find any chance to work together with us, please do not hesitate to contact me. You are always welcome to our company.