... :ISO Certificated 4:Long service life DTH drill rods1,Top-hammer drilling tools including thread button bits(R25,R28,R32,R38 ... rods, extension rods, shank adapter, etc2,DTH drilling tools including Air DTH hammer,DTH bits with COP, DHD, QL, MACH, MISSION, SD ... , XL shanks.Water DTH hammer, ODS system, etc3,Drag bits including Step and Chevron types ...