Extruded aluminum housing supplied internally with a formed and channeled 16 gauge steel frame supports the electrical components and main reflector. Housing fastens to a die-cast aluminum base with four 1/4"-20 phillips flat head screws.Base is secured to concrete footing using provided masonite template and three 3/8"-16 x 6" (152 mm) galvanized steel anchor bolts with leveling nuts and washers. Suggested poured base: 2' (610 mm) deep x 12" (305 mm) dia., depending on soil types and frost line in your area. A 3" (76 mm) dia. conduit opening is provided in the base for ease of wiring. Injection molded clear acrylic lens with specular collecting reflector attaches to the top of the housing with an over-lapping die-cast aluminum retaining ring, held by two stainless-steel allen flat head fasteners. Two silicone lens seals prevent moisture from entering the lens, while a double lip silicone seal at the top of the reflector and sealed lampholder prevent insects, dirt and moisture from entering the optical chamber.