SINODRILLS MF rods(Speed Rods)   M/F rods are different from extension rods or drifting rods, one end is male thread, another one end is female thread. M/F rods provide more tighter connection and easy uncoupling and handling. All our M/F rods are made from the same steels as Sandvik and produced by CNC maching and advanced heat treatment. Rods diameters: round 32mm, round 39mm, round 46mm, round 52mm; Thread size: R32, T38, T45,T51; Effective lengths:  915mm ~ 6100mm