Fluorescent Lampholder Recessed Double Contact Molded of white thermoset plastic for neat appearance and durability. For replacement use in fluorescent lighting fixtures as well as enclosedoutdoor signs. Recessed double-contact (2500, 2501) lampholders can be used for flush or surface mounting. Plunger lampholders feature non-sticking, spring-loaded plunger to hold lamp securely. Captive pal nut for easy mounting. Push-in wire terminals feature release slots.