SENTRY fenders were designed to protect modern, low-profile, boats like runabouts, tow boats, and fishing boats. You can attach them to cleats, handrails, or dock pilings, and it will protect your boat both above and below the rub rail.
Also, be sure to read the instructions included in the SENTRY box (little yellow booklet). If you have the SENTRY 1.0, pushing down on the fender is key to getting the straps to lock in place. Pulling on the loose ends of the straps to the desired height is not enough. Push down to lock and pull up to unlock the straps.With the new SENTRY 2.0 simply engage the LockCAM system by pressing on the tabs to loosen the strap and set it at the desired height. When you let go the LockCAM system automatically engages, locking the fender in place.