This small interior light is perfect for the trunks of most bikes. Easy to install and wires in so you will always have light. The polycarbonate 12V interior light comes with a nylon switch for easy on and off operation. It has a metal base surface and mounts with screws on a 3 ½ inch center. Separate ground and lead wires are supplied for electrical connection. Measures 1 ¾ inches x 3 ½ inches x 4 9/16 inches. Single.