... 3:ISO Certificated 4:Long service life DTH drill rods1,Top-hammer drilling tools including thread button ... ,T51, ST58, ST68, GT60), coupling, taper rods and bits, Speed rods/MF rods, extension rods, shank adapter ... hammer, ODS system, etc3,Drag bits including Step and Chevron types with "API Reg", "NRod" thread ... T6,WF,WG,etc), reaming shell, core barrel and drill rods.etc.5,Rock anchor tools, IBO anchor ...