After a long day of paddling no one wants to pull up to a dock to find no place to tie-off. Create your own with the Davis Instruments Portable Dock Ring. Made from zinc plated heavy-duty 5/16 inch (8 mm) steel the Davis Dock Ring provides a convenient way to tie up your boat. Simply insert between dock planks, rotate 90 degrees and slide the ring to the edge of the dock. It stays in place, even in wave action.