2-mile, 360 degree light visibility. For boats 12 to 20 meters -39.4 to 65.6 feet-. Universal fit. Focuses light at horizon and above- not in pilot's eyes. Controlled beam above horizon increases visibility to taller craft. Universal locking collar pole fits 95 percent of existing bases. Use in straight or angled light bases mounted on flat or angled deck surfaces. 2-Pin Locking Collar Pole.