Work smarter, not harder with Pat's Easy Change System. Let Pat's Easy Change System save you time and hassle. This easy to use Easy Change is flexible, durable, and affordable! Pat's Easy Change System changes lift arms from a standard ball to a hook system, allowing the operator to hook the lift arms to the implement from the tractor. It fits over the end of the lift arm (attached by a pin through the ball and a U-bolt for stability). It's all that is needed to hook up to all your implements, without lifting and moving heavy implements into position for attachment. No changes are necessary for the tractor or implements. Everything needed to install on a tractor is included in a set. Additional Information : Category#1 is 1-1/2” wide x 4” tall, 7/8” hole in the ball of the tractor