We are Hejian Zhankui Drilling Equipment Co., Ltd. Our factory Specialize drill bits, tricone bit, PDC bit, drill pipe, mud pump and stabilizers for water well, oil filed. Construction. Geotheraml. Directional boring and underground foundation work all over the world in1980, the only one in production PDC bit manufacture in our area. 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 used for oil filed. Water well from all over the world.