For boats to 39.4' (12 meters). Two mile, 360 deg. visibility. Stowaway design. Swivel cover on base protects base socket. Base extends 3'' below deck. 3/4" dia. anodized aluminum pole. Frosted screw-on globe. Includes Zamak base, 12 watt lamp. Base: 4"L x 1-5/8''W. 3 countersunk holes for #10 fasteners. Installation hole size: 1-3/8".