... bit are available for rock-Soft rock, loose-medium rock, hard rock and any other special formations thread button bits Thread button bits ... , R25, R28, R32, R35, R38, T38, T45, T51, ST58, T60Button bit face design: Flat face, drop centre, Normal and Retrac body ... Conical. (Threaded R32, R38, T38, T45, T51, bit diameter: 45mm-127mm); (2) Main button bits diameters:R32-45mm, R32-51, R32-64 ...