Powder-coated satin-black steel shell, chrome-plated steel bezel. Mounting flange diameter: 64mm Lamp diameter: 44mm Overall length: 82mm Mounts to bracket/fascia with 45mm diameter hole. Light has 3 wires: tail light, brake light and earth. There is a small clear window in underside of lens to illuminate the number plate with white light. Please note: Lens does have an "E" mark.