TE Connectivity Heavy Duty PLASTI-GRIP Ring Tongue Wire Crimp Terminals PLASTI-GRIP heavy duty closed barrel ring tongue wire crimp terminals made of high conductivity tin plated copper with an expanded high dielectric strength 94V-0 rated vinyl insulation sleeve. The inner barrel of these PLASTI-GRIP closed barrel ring tongue crimp terminals is serrated in order to provide maximum electrical contact and tensile strength after crimping. The funneled entry on the wire barrel enables the stripped wire to be inserted more easily. These PLASTI-GRIP ring tongue crimp connectors have a heavy duty design for extra mechanical strength.