... )Including:Shank H22x 108mm, (6, 7, 11, 12 degree taper) taper rods in most lengths.A comprehensive range of button bits ... with (6, 7, 11, 12 degree taper).Bit diameter: 28mm-57mm.3. Extension drilling toolsButton bit, face design: Flat face, Drop centre, ... Spherical, Ballistic and Conical. (Threaded R32, R38, T38, T45, T51 ; bit diameter: 45mm-127mm);Couplings sleeves- manufactured with a middle stop ...