1)certified by ISO9001&API 2))used for water well, oil field 3)IADC:114,115,117,127,437,517,617, ... )be used for water well, oil field, underground, construction, geothermal, directional boring5)Be used to drill low compressive strength,soft formation6)various ... etc9)high quality and competitive price10)including drill rods,drill collar,rerun steel tooth bits, ,used drill bits stock,used mud pumps,etc ...