Thermoplastic, has built-in clamp tight strain relief. Well suited for appliances that require frequent plugging and unplugging. For use with No. 20, 18 and 16 AWG flat SPT cord. May also be used on 2-wire round cord up to 1/4" diameter. (No. 18 SV and SVT). 15A/125V. NEMA 1-15P. UL (Underwriter's Laboratories) listed. Use with model No. 102 connectors.