... body.tungsten carbide(Buttons):Spherical, ballistic and Conical.(Threaded R32, T38, T45,T51, bit diameter: 45mm-127mm);Couplings sleeves-manufactured with ... thread. Include couplings sleeve(threaded R22,R25,R28,R32,R38,T38,T45,T51)Shank adapters-carburized and manufactured with tight tolerances ...