The Tractor Supply 5/16 in. x 1-1/8 in. Coupler Pin and Clip can help make coupling and uncoupling your tow setup simple. That's because inserting the pin helps the trailer coupler lever stay in a safely closed position while in use, or in an open position when uncoupling. The included 7 in. safety chain also allows for the pin to hang freely while not in use, which is ideal for marine applications. As long as your lever has a 5/16 in. diameter hole, this pin and clip set would make a great addition to your collection of towing supplies and accessories. Each component is made with durable zinc plating for rugged, long-lasting reliability. Satisfaction guaranteed. Looking for more trailer couplers and accessories? Check out Tractor Supply's Towing Program for towing parts that meet your needs today.