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U-Joint Tire Swivel Knuckle With Clamps:commercially designed to hang tire swings from a 2 3/8" pipe and has been designed for easy installation. This commercial grade knuckle with clamps is made to be very heavy duty and has been conservatively rated to hold 500 lbs. This knuckle requires monthly maintenance in the commercial environment, or annual maintenance in the residential environment. This unit is incredibly durable and will last.