This light has a metal die cast housing with a red acrylic lens. Has a narrow depth behind flange that allows the lamp to fit where other lamps cannot. Mounts through 4-1/2" dia. cutout and depth of 1-1/4" depth behind the flange. Mounting screw holes are 4-1/4" on center and the lens mounting holes are 3-1/16"center. Has chrome housing. Uses 1157 replacement bulb.