All kinds of standard roller chain sprockets (with hub or without hub),cast iron (GG25) ,Taper lock (TB),finished bore sprockets Sprocket wheelProcedureForging, Maching, Hobbing, Broaching, Driliing, Milling, GroundingSurface TreatmentHeat Treatment, Black Oxide Finished, Zinc Plated, Phosphating, PaintingIn Different Colour Sprocket wheel