Single Folding Door: The single folding gate has a retractable door width structure. Collapsed Size(HxW): 51.57 x 4 in; Expanded Size(HxW): 51.57 x 74 in. The standard size is suitable for use as safety doors, barricade gates seeking protection, and defend. Durable Security Gate: This security gate is built by heavy-duty 3/4' 14 gauge channel steel with a black powder finish to enhance durability. Its exclusive non-interference design guards your properties safely and effectively prevents unexpected intrusions. Flexible Rolling Caster: Designed with rolling casters in the bottom to swing up to 360 degrees and with lock designs to fix the position. The side-folding door can stay in an unobstructed clear-opening state or complete closed condition. Such a smoothing rolling security gate brings you convenient transport and storage