... service life DTH drill rods1,Top-hammer drilling tools including thread button bits(R25,R28,R32,R38,T38,T45,T51, ST58, ST68 ... bits including Step and Chevron types with "API Reg", "NRod" thread.Claw tybe bits, Clay bits,etc4,Diamond core drilling tools ... including the diamond core bit(BQ,NQ,HQ,PQ,TT,T2,T6,WF,WG,etc ...