"The durable steel hook with zinc coating is made to take abuse day in and day out. A narrow shape of the chain hooks make it easy to attach to rub rails and other hard-to-reach anchor points that other hooks may not be able to reach. Features of the chain hooks include u-shaped clevis bases that attach to 3/8"" chains with clevis and cotter pins. The cotter and clevis pins can be removed so the hook can be used on separate chains. A 6,600 lb. working load limit allows use with securing heavy equipment such as skid-steer loaders."