Halo Red LED 4" Round Trailer Truck Stop Turn Brake Tail Light 5.5" Flange MountPair Of 21 LED 4" Round S T T "GLO" Lights Dual Function Light. Tail Lights and Brake Turn Signals 21 Red LED w Red Lens Plastic Flange Mounts Unique Patent Pending, "GLO" Design, Halo Effect on Tail Lights All LEDs Lit For Turn Brake Function 3 Contact Female Terminal 3 Prong Male Pigtails Included Black Plastic Flange Measures Approx. 5. 5" Diameter Fasteners Not Included