No cleat or ring in place? Rings in the wrong place? Then use Portable Dock Rings as a convenient way to tie up your boat. Easy to use, just place between 2 dock boards, turn 90 degrees and slide to the end of the dock. Made of 5/16" (8 mm) heavy duty steel. Tested to hold even in wave action. Zinc plated to resist rust for years. Patented.