Designed for 15K and 16K Select Series and 18K Select Plus Series. 12" Travel front to back. Round tube design allows for smoother operation. Operations from either side of unit. Angled steel rollers reduces binding. Operates even when vehicle not in straight line; operation up to 45 degree angle. Lock pin for additional security. Rubber grip handle for comfortable operation. Tapered holes for easier pull pin engagement. 3" wide attachment allows for use with other 5th wheel hitches. Uses existing base rail design. For use with Short box pick-ups. Prevents damage to cab when spotting trailer. NOTE - Must order separately #30035, Rails and Mounting Bracket Kit for Full Size trucks. Does not work with Signature Series Fifth Wheel Hitches.