drifter drill rod 1)thread:R22,R25,R28,R32,R38,T38,T45, ... 3)length:0.4-6m 4)diameter:39-52mm Extension drill rod 1)thread:R22,R25,R28,R32,R38,T38,T45 ... , 3)length:0.4-6m 4)diameter:39-52mm MF drill rod 1)thread:R22,R25,R28,R32,R38,T38,T45 ... 3)length:0.4-6m 4)dia:39-52mm Speed drill rod 1)thread:R22,R25,R28,R32,R38,T38,T45 ...