Although most Perimeter Dock & Post bumpers are flexible enough to mount around curves, our customers have requested standard corner bumpers to create a "finished", "quality" look to the 90 degree outside corner of the dock. Our corner sections are designed to match up perfectly with our medium, large and X-large Dock Bumpers and extend 12" along each side of the dock from the corner point. Mounting flanges are incorporated both top and bottom for secure installation. Creat a finished look They match with our dock bumpers | Corner Bumper White 4" x 12"L