1-mile visibility for sail or powerboatsunder 12 meters (39.4')12V DC - 6 CP. Predrilled with threecountersunk holes to accommodate #8 screws. Base: 1-5/8" (4.13m) x 4" (10.46cm). Head and pole are triple chrome plated zamak. Non-corrosive plastic socket. 10"(25.4cm) in height.