When your DTH hammer or drill pipe gets jammed underground, the Back Hammer is your solution. A percussion mechanism mounted above the drill string — activated by opening the air throttle. Mounts upside down to drive or withdraw casings. Only 5 main components: barrel, piston, support ring, spindle and plug. 3½" API Reg pin and box thread. PG Hammers are opened FREE at our Germiston workshop.
