In our goal of being your best source for all things towing, the CURT line of trailer jacks is designed with care and manufactured with pride. CURT jacks are made with quality to promote the life and function of your trailer, and they come in several different styles to accommodate your needs, whether you are a frequenter of the boat landing, the campground, the racetrack or the farm. This replacement retainer pin is intended fit the CURT direct-weld square jack #28512. It features a spring-loaded design and inserts into the jack foot to keep it stored during travel. It features a 3/4" pin diameter and comes with a spring, washer and cotter pin.