Stud-mount light functions as a side marker or clearance light with reflex. Grounds through mounting stud. Unit has single wire for electrical connection. Features 15,000-hour long-life bulb. U.S.A. Light Size (in.): 2 3/4 x 2 1/8 x 1, Connector Type: Single-wire, Light Color: Red, Bulbs Per Light (qty.): 1, Light Shape: Square, Lights Included (qty.): 1