DTH Hammer, DTH Bit, Reverse Circulation Hammer manufacturer / supplier in China, offering Pr54 / Pr54r RC Rock Drilling Bit for Reverse Circulation DTH Hammer, Pr54 RC Drill Bit for Reverse Circulation DTH Hammer, China High Air Pressure DTH Drilling Hammers DHD, SD, Ql, Mission, Numa, Cop and so on.