Specifications Tail light size with grommet: 7.5”*3.3”*1.75” Hole size: 6.6”*2.5”*1.75” LED Quantity: 10PCS each light, high quality SMD and super bright LED Color: Red Working Voltage: 12V DC Waterproof rate: IP65 Output high and low brightness, work as turn/brake light and tail light Package Include 6" Oval Tail Light 6" Oval Rubber Grommet 3-Pin Connector. Tail light size with grommet: 7.5”*3.3”*1.75” See moreUniversal Application: Work on 12V DC system, function as turn/Brake light, tail light for all kinds of trucks, trailers, tractors, semi-trailer, horse trailer, travel trailer, dump Truck, special vehicle, etc. Just make sure the hole size before your purchase. 2 Years Warranty Honored by Nilight. Ready For The Weather: Be highly silicon sealed, IP67 waterproof rating, always be ready for different kinds of weather attack. Upgraded Unique Design: Niligh's tail light has unique “ears” on its two sides, upgrade notches on the inside of grommet, and a tighter attaching ability between 3-prong plug and it. These help the light fit perfectly and firmly on the grommet, and the 3-prong plug attaches tightly on the light. Shake proof, there will be no worries of loosing light or wires. Easy Installation: The taillight comes with grommets for surface mount, also added a 3-prong watertight plug with attached wire. For installation, you just need to surface mount the grommets & light setup, and then connect the 3 wires to the corresponding wires on vehicles. Hole size for surface mount is: 6. 6” x2. 5” x 1. 75”. Awesome Brightness: Each tail light has 10PCS high-quality SMD LEDs to output super bright red light, high brightness for Turn/Brake light, low brightness for Tail light, improving visibility and ensuring you a safer night.