... drilling rods 1.Sturdy & effective for rock drilling 2. Available in ... ST58, ST68, GT60), coupling, taper rods and bits, Speed rods/MF rods, extension rods, shank ... "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), reaming shell, core ...