This is a 2-prong nylon stern light pole base in black that is suitable for most of the navigation lights. This light pole base comes with a snap-in cover to keep it clean and dry when not in use. It fits most 3/4 round 2-prong stern light poles. It also works with 3/4 flag poles that are telescopic. This item comes with wire as well for wiring purposes. Dimension: 2-1/2" (L) X 1-3/4" (W) X 3-1/8" (H). Item: PM151272 This is a 2-prong nylon stern light pole base in black that is suitable for most of the navigation lights. This light pole base comes with a snap-in cover to keep it clean and dry when not in use. It fits most 3/4 round 2-prong stern light poles. It also works with 3/4 flag poles that are telescopic. This item comes with wire as well for wiring purposes. Dimension: 2-1/2" (L) X 1-3/4" (W) X 3-1/8" (H). Item: PM151272