... for various formations by matching cutting structure with different tooth shape, tooth density and tooth exposure height.6)various of model and dimension ... and competitive price10)including drill rods,drill collar,rerun steel tooth bits, ,used drill bits stock,used mud pumps,etc ... 114-117,127,437,517,617,637 TypeTricone bits,Steel tooth bits,PDC bits Appliable water well, oil field, construction, ...