Plastic Wall Plates. Non-flammable thermoplastic, phenolic or urea material. Color-matched 1/2 inch long steel mounting screws furnished. Smooth surface - no recessed areas to collect dirt, discolor. Easy to clean. Full weight and thickness provide high dielectric strength, minimum moisture absorption, impact resistance. Warp resistant, fit flush to wall. U.L. Listed. C.S.A. Approved.