PLUG-IN MODEL - Two mile all-round light for boats up to 39.4 ft. (12m) in length. Convenient all-round light can be removed from base for storage. Swivel cover on base protects the socket when light is stowed away. Base extends just 3" below deck. Includes Zamak base and one 12 watt lamp. Base dimensions: 4" long X 1 5/8" wide. Installation hole size: 1 3/8" diameter. Base is pre-drilled with three countersunk holes for #10 screws.