interlocking kelly bar matched Bauer drilling rig

      Locking  drilling bar, three key type and six key type two kinds, steel material adopt high quality alloy steel seamless steel tube, welding in the key on the road for high wear-resisting drive keys. The key driver, according to the outside pressure stroke with three or four pressure point, when the pipe to drive into the driver turns key point, the key pressure produced by the pressurized cylinder pressure, with head and drill through direct transmission to drill, can apply in neutral layer, hard soil or rock layer.