PRODUCT DESCRIPTION Eastern Jungle Gyms Heavy-Duty Tire Swivel comes pre-greased and ready to use! Our heavy-duty tire swivel is designed to attach a tire swing to a wooden swing beam and allows for 360 degree spinning and tons of fun. Our tire swivel is galvanized, made of heavy-duty steel and includes a grease fitting for regular periodic lubrication. It also features two pre-drilled holes for easy attachment to a wooden swing beam. We recommend using thru-bolts or lag bolts to mount our tire swivel mounting hardware is not included as the size of the hardware will depend on the size of the swing beam that is being used. FROM THE MANUFACTURER The Eastern Jungle Gym Backyard Tire Swivel provides the perfect hook-up for attaching a tire swing to a wooden beam. Complete with ball bearings and hardened steel ball, this tire swivel allows for 360 degree fun! Mounting hardware is not included. If attaching to a 4x6 beam, 2 - 6 1/2" x 3/8" Hex Bolts are recommended.