The Secure A-Frame was designed for ease to use to increase worker compliance. Simply load the A-frame as you normally would, place the Secure A-Frame upright post into the steel foot, and slide the arm and pad down until it touches the slab and locks it in place. The Secure A-Frame upright arms are held in place with hardened steel pins, while the feet are inserted into the base of the existing A-Frame and are secured with safety chains. A tamper-resistant key prevents unauthorized removal of the safety arms. The is product sold in packages of two uprights with locking arms, with two bases and safety chains. This secures one side of an existing A-Frame.