1.Threaded Button Bits Button bit, face design: Flat face, Drop centre, ... rod mainly include MF rod, extension rod, drifer rod, shank end adapter rod, own high fatigue strength, elasticity, ... T51 T38,R22, R25, R28, R32, R38, ). 4.Shank Adapters R32, R38, T38, T45, T51 thread rock drilling ... shank adaptors are carburized and manufactured with tight tolerances and ...