... R32, R38, T38, T45, T51 etc.) Retrac Button bits with different Thread different diameters. 2. Dth bits: From 115mm, 120mm ... 32mm, 34mm, Length can be according to customers requests. 7. Coupling with different thread for example R22, R25, R28, R32, R38, ... T45, T51 etc8. Shank AdaptorsShank adaptors-carburized and manufactured with tight tolerances and controlled straightness R28-41 thread button bits