DTH Drill Rig, Screw Air Compressor manufacturer / supplier in China, offering 29m³/Min 23 Bar Heavy-Duty Portable Diesel Screw Air Compressor for Mining, Quarry, Rock Drilling & Foundation Work, 22 Bar 24m3/Min Heavy Duty Portable Diesel Screw Air Compressor for DTH Drilling, Factory Direct 712 Split-Type Rock Drilling Rig and so on.