Partsam 2PCS 4" Red Stop Turn Tail Brake Truck Trailer Light Flange Mount 12 Diodes Utility Partsam (2 x Red) Sealed Waterproof 12 LEDs light Stop Turn Tail Brake Lamps for Trucks, Trailer, RVs, and Boats. Acrylic lens is sonic welded to the housing, waterproof lens and housing in a single unit. All-weather molded plastic housing and durable lens protect against corrosion. Outer Diameter: 140mm (5.5''); Inner Diameter: 105mm (4.1''); Height: 24mm (0.9''); Hole Distance: 104mm (4.1'') EASY TO INSTALL: White Wire is the Ground; Red Wire is the high brightness; Black Wire is the low brightness It all started in the summer of 2013 with a simple, with bold idea: make better auto parts. In other words, not just a better auto parts - a better way of doing things. A new kind of auto company that works hand in hand with users to do something amazing, something meaningful. Now PARTSam has grown tremendously to become one of the leading platforms of e-Commerce in the aftermarket auto parts industry. Inventory Management/Warehouse &amp; Fulfillment  With our warehouse located in Milpitas, California, we take care of the inventory management for our products. This saves manufacturers space, time, and headache. Automated Multi-Channel Sales  We successfully advertise our products on multiple platforms and maintain top-rated healthy seller accounts, which keep customers drawn to our products. We are continually expanding our customer base as we add more sales channels. Professional Seller - Customers will deal directly with us in regards to issues and concerns they experience with the products. Manufacturers will not have to deal directly with the individual customers, but will experience the benefits of their business, which is the typical win-win cooperation. Universal for Trucks,trailers,tractors,semi-trailer,Dump Truck,bus,boat,special vehicle,etc. For Heavy Duty trucks like Kenworth Peterbilt Freightliner Western Star Volvo International Mack Paccar and other Truck lights Size: 5.5&#034; (outer) x 4&#039;&#039; (inner)&#039;&#039; x 1&#039;&#039;; These Lights are impact resistant and less susceptible to shock damage. Each LED Light is water-tight sealed; These LEDs draw less current, generate less heat and are brighter and light faster than an incandescent bulb; 4&#034; Round LED Trailer Stop, Turn, Tail Light; Flange Mount - Red;