We are Hejian Deris Petroleum drilling equipment Co., Ltd Drilling Supplies Marketing Dept. specializes in drill bits, drill pipe, Mud pump and stablizers for water well, oil field, construction, geothermal, directional boring, and underground foundation work all over the world. Our purpose is to sell the best quality products at the lowest possible price. We are a professional supplier of new and used(rebuilt) drill bits. Including tricone bits, PDC bits and drill pipe. Various of madel and dimension available. Good condition and reasonable price. We also import junk tricone bits and PDC bits.