Pneumatic down-hole hammer, middle-low air pressure, no valve type structure, low ... .5-1.7450-80010-141400118Φ114,227 WC pneumatic down-hole hammer, middle-low air pressure, no valve type structure, ... used with all kinds of anchor rigs and engineering rigs. Wall thickness, length, thread of flat drill rods can be made ... requirements. Or produce according to your requirement! Pneumatic down-hole hammer