... hex, Bit diameters include 20-42mm.2. Tapered drilling tools (Tapered Drill Steel)Including:Drill rods with Shank H22x108mm,(6,7,11,12 degree ... and retrac body.tungsten carbide(Buttons):Spherical, ballistic and Conical.(Threaded R32, T38, T45,T51, bit diameter: 45mm-127mm);Couplings ... to prevent walking along the thread. Include couplings sleeve(threaded R22,R25,R28,R32,R38,T38,T45,T51)Shank adapters ...