Attwood Light Base - Base is constructed of die-cast Zamak chrome-plated finish. Swivel cover protects the socket when light is stowed away. Socket is keyed to prevent incorrect insertion of pole light. Three countersunk holes for installation fasteners. Includes 7 1/2" hard wire leads for connection to 12VDC. Base is constructed of die-cast Zamak chrome-plated finish;4" Long x1 5/8" wide. 1 3/8" dia. hole size.