This 1470 Delta Series model features an adjustable pole rake with locking and threaded collars. The length of this navigation pole light is 36" length. Delta Series Universal replacement lights are designed to fit most other manufacturers' bases. They feature two collars (one threaded and one locking), two interchangeable globes (one reduced glare and one full output), two screw positions, and an adjustable head (wide 40°). Adjustability of the globe allows for proper horizontal alignment regardless of base configuration. Delta's list of features put it in a class by itself. No other pole light system offers more. The Reduced Glare advanced globe design helps preserve night vision by reducing the amount of light wasted outside of the visibility zone and offers improved visibility when in rough water and from above. Certified for use on Power Driven Vessels under 20 meters in length. Locking collar fits figures 1045, 1046, 1047, 1059, and 1060 bases and the threaded collar fits figure 1048 two-pin base from Perko's Recreational Catalog.