4-1/4" Diameter round. Waterproof trailer light functions as a stop, tail, and turn signal light when properly mounted. Shock-proof socket protects incandescent bulb. Flush mount with grommet (sold separately). Accepts 3-prong plug. Great Prices for the best trailer lights from Optronics. Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Round - Red Lens part number ST45RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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