Helps resist complete vehicle-trailer separation during a disconnectFeatures a minimum break force of 5,000 lbs.Chain assembly must meet or exceed gross trailer weightGrade-30 rating for good tensile strength in utility applicationsAssembled with one 7/16" snap hook for secure attachmentProtected by a durable zinc-plated finishLimited lifetime warranty (one-year finish, one-year parts)NOTES:Safety chains or cables are required while towing