Optional set of four caster wheels for use with outdoor Zephyr Presrv® coolers, kegerators, and refrigerators in freestanding installation. Installing casters will make storing and relocating your Presrv® product easy. Brakes are used to lock wheels into place to prohibit movement. Please check your Zephyr Presrv® cooler, kegerator, or refrigerator’s specification sheet to ensure compatibility.