... Rods)Shank H22x108mm, H19x108mm, standard hex. Bit diameters include 20-42mm.2. Tapered drilling tools (Tapered Drill Steel)Including:Shank H22x 108mm, ... of button bits, cross bits and chisel bits with (6, 7, 11, 12 degree taper).Bit diameter: 28mm-57mm.3. Extension ... Ballistic and Conical. (Threaded R32, R38, T38, T45, T51 ; bit diameter: 45mm-127mm);Couplings sleeves- manufactured with a middle stop ...