Abstract: An improved technique of threading for metallic bottles where as the neck of the metallic bottles will receive a protrusion or profile, onto which an independently made threaded collar is shot. And fastened by seaming (this discards the slow process of seaming each unit individually), the seam is then bent/curled inwards forming a neat drinking orifice; the ROPP cap, screw cap, crown cap or pull cap etc. is fitted on and after filling, a profiled, concave dome end shell is added to the bottom of the aluminium or metallic bottle and sealed by seaming.