For indoor or outdoor lighting. Die cast zinc construction. Powder coat finish. Scratch resistant. Locking swivel knuckle assures lamp positioning and directional aiming. Porcelain socket, inside gasket. 1/2" locknut. Multi-lingual instructions. UL Standard 1598 CSA certified C22.2 no. 18 compliant. Shrink wrapped. LAMPHOLDERS Color=White ARCHITECTURAL - SINGLE