The Heavy Duty Tire Swivel is designed specifically for round top rails. The hardware is made up of superior materials, which makes it very durable and it is surprisingly affordable. The swivel joint is coated with rubber boot so that it has superior rotational and swiveling properties. This swivel can rotate 36-degree, a requirement for a tire swing. The chains attached to the swivel will neither be twisted nor tangled. This Heavy Duty Tire Swivel is available at wide range of sizes. Go and request it soon and watch your child swing away.