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 75 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. Easy Lock & Installation: The fence security gate has a padlock hasp for locking, and the door kit comes with a separate padlock with keys for using accordingly with the hasp. A set of mounting tools is included to provide a breeze installation and hassle-free use for you. Wide Range Application: It is widely used at home and industrial places to close or lock off an area while maintaining its visibility and allowing unobstructed air circulation, adding security for the basement, garage, storefront, etc.