Exclusive M4LED.com Light Cover slide over the front of your double row light bar and is made of strong ABS Plastic. This cover fits double row light bars sold by M4, and will also fit others that are no larger than 2.850" in height at the bar itself. If we don't offer a size you need, you can order a longer one and cut it to size with a fine tooth saw. Light covers are required in many states, but also protect your lights when not in use. The double row light covers also have a smooth front surface where you can add your own decals.