Make your Bench mobile by ordering these heavy-duty 5" Casters. Move your Bench with ease over all types of surfaces. Casters are single wheel, made of rubber with a 1/2" threaded stem that screws into the same mounts that the glides use. Casters come in a set of four, two locking and two non-locking. Positive lock action ensures that the Bench will not move when in locked position.