... most lengths.button bits, cross type bits and chisel bits with(6,7,11,12 degree taper). ... 57mm.3.Extension drilling toolsButton bit, face design :Flat face, drop centre, Normal and retrac body.tungsten ... R22,R25,R28,R32,R38,T38,T45,T51)Shank adapters-carburized and manufactured with tight tolerances and ... CIR150,CIR170etc,DTH drill bits:60mm-254mm bits with flat face, concave design fit for the atlas copco ...