... service life DTH drill rods1,Top-hammer drilling tools including thread button bits(R25,R28,R32,R38,T38,T45,T51, ST58 ... bits including Step and Chevron types with "API Reg", "NRod" thread.Claw tybe bits, Clay bits,etc4,Diamond core drilling tools ... , nut, plate,coupling.), Rebar rock bolting, Friction bolting. etc. Drill rod