... , oil field, underground, construction, geothermal, directional boring5)Be used to drill low compressive strength,soft formation6)various of model and dimension ... etc9)high quality and competitive price10)including drill rods,drill collar,rerun steel tooth bits, ,used drill bits stock,used mud pumps,etc Model ... Piece Supply Ability500 Pieces/month Delievery Time within 30 days drill bit