Marine grade die-cast aluminum. Rib reinforced construction. Integral heat sinks. Housing flange interlocks and wraps around lens base producing maximum moisture deflection and resistance to prying. Housing provided with four standoff mounting holes, one 3/4" NPT tapped hole on back of housing, four 3/4" NPT tapped and plugged holes on sides of housing see Cross Section/Details. Standard black, bronze or white exterior TGIC polyester powder coat 5-step pre-treatment. See Ordering Information for optional finishes.