drifter drill rod 1)thread:R22,R25,R28,R32,R38,T38,T45,T51 2)rod size:hex 22mm,25mm,28mm, ... length:0.4-6m 4)diameter:39-52mm Extension drill rod 1)thread:R22,R25,R28,R32,R38,T38, ... length:0.4-6m 4)diameter:39-52mm MF drill rod 1)thread:R22,R25,R28,R32,R38,T38,T45 ... :0.4-6m 4)dia:39-52mm Speed drill rod 1)thread:R22,R25,R28,R32,R38,T38, ... T45,T51 2)rod size:hex 22mm,25mm,28mm,32mm,35mm 3) ...