Rat guards are spring-loaded devices designed to keep critters (rats, mice and iguanas) away from vessels or containers. The rat guards by Foothills Products feature polypropylene construction with stainless steel components for application in both fresh and salt water environments, and a patented spring door to make installation and removal easy. These lightweight rat guards strongly grip the mooring lines and do not bend with repeated use. They are available in three different diameters (10, 15 and 17 inches).