... all sizes 3:ISO Certificated 4:Long service life DTH drill rods1,Top-hammer drilling tools including thread button bits(R25 ... ,etc4,Diamond core drilling tools including the diamond core bit(BQ,NQ,HQ,PQ,TT,T2,T6,WF,WG,etc), reaming shell, core barrel and drill rods ... bits, nut, plate,coupling.), Rebar rock bolting, Friction bolting. etc. Drill rod