IADC537
                        Customized
                        DIN, API
                        Taper-length
                        Low Air Pressure DTH Bit
                        Cobalt Steel Alloys
                        Well Drilling, Coal, Ore, Quarry, Construction
                        Construction Works , Energy & Mining
                        Oil,Gas,Geothermy,Water Well Drilling,Mining and
                        Elastomer Sealed Bearing
                        QIDELI, LEILI
                        Wooden, or Others
                        iso9001
                        China
                        8207199000
                        


