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. These replacement gears are intended to fit CURT direct-weld square jack #28512 and provide smooth raising and lowering of the jack post. The kit includes two gears and two shear pins.