Lightweight aluminum oval carabiners have hundreds of uses, but these are top-quality climbers’ models, rated at 4,500 lbs., essential for river rescue. These ‘biners are 2″ x 4″ with a 5/8″ spring-loaded gate opening that lets them be snapped onto lines or into pulleys. Locking carabiner has a threaded sleeve that locks the gate in the closed position so it can’t open accidentally. Colors are anodized aluminum, not painted.