Side-mount casters (also known as gate casters) have vertical mounting plates that attach to the sides of gates, doors, fences, and other heavy equipment that won't support a traditional plate or stem caster. The casters allow the equipment to roll, which reduces the effort it takes to move it. The casters' spring-loaded suspension absorbs shocks to provide a smooth ride even when the casters are rolling on uneven surfaces. Side-mount casters are used in a wide variety of industrial, commercial, and residential settings.