Lock drilling machine, three key type and six key typetwo kinds, steel material adopt high quality alloy steel seamlesssteel tube, welding in the key on the road for high wear-resistingdrive keys. The key driver, according to the outside pressurestroke with three or four pressure point, when the pipe to driveinto the driver turns key point, the key pressure produced by thepressurized cylinder pressure, with head and drill through directtransmission to drill, can apply in neutral layer, hard soil orrock layer.