... all sizes 3:ISO Certificated 4:Long service life DTH drill rods1,Top-hammer drilling tools including thread button bits(R25 ... diamond core bit(BQ,NQ,HQ,PQ,TT,T2,T6,WF,WG,etc), reaming shell, core barrel and drill rods.etc.5 ... bits, nut, plate,coupling.), Rebar rock bolting, Friction bolting. etc. Drill rod