... T45-102MM,T51-89MM, T51-102MM, T51-127 etc. Button bit face design: Flat face, drop centre, Normal and Retrac body ... Spherical, ballistic and Conical. (Threaded R32, R38, T38, T45, T51, bit diameter: 45mm-127mm); Couplings sleeves- manufactured with a middle stop ... , and more, and are widely used in dam construction, slope anchor, mine exploration and tunnel excavation, and other similar projects, and ...