Ironton Bolt-On Side-Wind Marine Swivel Jack - 1,000 Lb. Capacity, Zinc Finish Durable 1/2in. pull pin activates the swivel mechanism, allowing you to swing the jack up and out of the way when not in use 6in. wheel for easy maneuvering &#160;Bolt-on mount fits trailer frames up to 3in. x 5in. &#160;Includes mounting hardware Measurements: A=Retracted (12 3/4in.), B=Extended (22 3/4in.), C=Clearance (10 1/2in.) (see corresponding diagram)