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 snap ring is intended to fit a variety of CURT jacks, including marine jack #28100 and bracket-mount swivel jacks #28300, #28302 and #28304. It features a 2-1/2" diameter and helps ensure easy swiveling of the jack post to be folded up and out of the way when not in use.