Everything about this Heavy-Duty Flat Plate Tire Swivel has been thoughtfully designed. Starting at the top, SportsPlay Equipment has made the top plate ideal to be easily installed through a steel or wood beam, or another type of flat surface. A rubber boot has also been added, which protects the moving parts while a grease fitting ensures easy maintenance, because no one wants to worry about maintaining their hardware! What is most special about this piece of hardware is the three-point mounting system, which decreases pinches and tangles. If you have a tire swing on your playground, this affordable swivel is a crucial component to ensure proper function and increase safety. Not to mention, at such an affordable price, it is nearly impossible to resist.