This E900 hardware bag is designed for one-piece steel garage doors that use a two-spring setup. It includes the key hardware needed for installation or replacement, including C-hooks, spring anchor chains, spring anchor plates, a lock ferrule, slide lock, and an assortment of bolts, screws, and other related hardware. Depending on the application, the set may include C-hooks or W-hooks. A convenient replacement hardware kit for maintaining or completing an E900 one-piece door system.