... design: Flat face, drop centre, Normal and retrac body.tungsten carbide(Buttons):Spherical, ballistic and Conical.(Threaded R32, T38, T45,T51, ... , CIR150,CIR170etc,DTH drill bits:60mm-254mm bits with flat face, concave design fit for the atlas copco and ingersoll-rand model etc ... 30mm,33mm,38mm,etc.8. Blast furnace tap hole drill tools.(Rod, Cross type bits, button bits and X type bits etc) Drill bits