Partsam 2 Amber + 2 Red Truck Trailer 2.5" Round Side Marker Led Clearance Light 4LED 12V Partsam (2xRed + 2xAmber) 2.5" 4LED Round Led Truck Light, Led Marker Light, Side Marker Light, cab roof marker light. Side marker and clearance light, serves as clearance, side marker or identification light, turn singal light. Compatibility: 12V trucks, trailer, boat trailer, horse trailer, travel trailer, camper, RV, motorhome etc. You can use them on any applications: left right front rear Top Roof Truck Bed Size without grommet: Outer Diameter: 81mm(3.1''), Inner Diameter: 62mm(2.4''); 2 Wires Connection: Black is the negative and red is the positive. 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.