Heavy Duty “U” Shape Leaf Bumper Spring w/Mounting Hardware & Restraint Strap. Factory assembled with restraint strap installed. Heavy duty, zinc plated bracket. All mounting hardware included. Heat treated part, rounded ends. This innovative bumper spring assembly–the first of its kind–includes an installed restraint strap that keeps it attached in the event of bumper spring failure. No more falling steel parts to damage objects below, or cause a home or workplace hazard. The heavy duty bracket and factory installed restraint strap assembly comes complete with hardware for easy installation. 8/ctn No well-dressed door should be without one!