"Think safety first. Attwood Trailer Safety Chains with Spring Clips connect the trailer tongue to the trailer hitch on the towing vehicle for security and safety. The chain meets SAE specifications. Welded, solid-steel construction provides reliable durability, with a bright, zinc-plated finish and S-hooks at both ends. Each trailer requires 2 chains. 51""L x 1/4"" dia. Welded solid steel Zinc-plated finish Meets SAE specifications Spring clips S-hooks"