Base is constructed of die-cast ZAMAK with Perma-Plate chrome 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 12 VDC power supply. Dimensions: 4" long x 1-5/8" wide. 1-3/8" diameter installation hole size