Trailer coupler safety chain features strong, heat-treated S-hooks to keep your trailer from separating from the tow vehicle if the coupler becomes unhitched. Integrated security spring clip prevents accidental unhooking. Zinc-plated construction is designed to resist corrosion. Class III chain with 5, 000-lb. weight capacity. 1/4" chain size. 24"L. Integrated security spring clip Zinc-plated construction resists corrosion | Class III Safety Chain Set, Pair