Truck Tail Lights Compatible for Trailer LightingCombination trailer tail light serves Multi functions on trailers over 80 inch wide - 10 LED Red outer ring for tail lights and also brake functions and dual function yellow 6 LED inner circle for Reverse and Backup Functions;. 5.4 inch diameter Grommet Ring and 4 inch diameter light lens; Red lens set inside lens with red and yellow ; Inner Yellow 6 LED + Outer Red 10 LED; Surface mount with grommets and 4 Wires Design;Drill hole about 4.5 inch. to install;Hardwired With 4-wire connection system: Black Wire - Negative / Red Wire - Brake Light / Blue Wire - Taillight or Running light / Yellow Wire - Reverse Light;These Lights are impact resistant and less susceptible to shock harm. Each LED Light is water-tight sealed. These draw less current, generate less heat and are brighter and light faster than an incandescent bulb;Applications: Universal Fits All vehicles with 12-24V Power Supply such as car, trailer, Semi Trailer, Semi Trucks, boat, flatbed, bus, lorry, caravan, , RV etc.Placement on Vehicle Rear, Left, RightWater Resistant, ShockproofMaterial:ABScolour:red+yellow+silverPackage Contents:2 * 4 inch Round Red/Amber 16 LED Truck Brake Tail LightsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.