... .Sturdy & effective for rock drilling 2. Available in all sizes 3:ISO Certificated 4:Long service life DTH drill ... rods1,Top-hammer drilling tools including thread button bits(R25,R28,R32,R38,T38,T45,T51, ... Step and Chevron types with "API Reg", "NRod" thread.Claw tybe bits, Clay bits,etc4,Diamond core drilling tools ... plate,coupling.), Rebar rock bolting, Friction bolting. etc. Drill rod