... retrac body.tungsten carbide(Buttons):Spherical, ballistic and Conical.(Threaded R32, T38, T45,T51, bit diameter: 45mm-127mm);Couplings sleeves- ... along the thread. Include couplings sleeve(threaded R22,R25,R28,R32,R38,T38,T45,T51)Shank adapters-carburized and manufactured with ... and controlled straightness.4. Down the hole hammers and DTH button bits (Down The Hole Drilling)Offer ir hammers,DHD3.5 ...