Reese Towpower 5/8 inch pin and clip is designed to fit class III / IV, Reese 33, 36, 36, 37, 44 and 51 series hitches with 2 inch hitch boxes. This pin is 5/8 inch in diameter and includes the spring cotter pin. The PVC comfort grip is designed to protect the hands and allow for a better grip while inserting or removing the pin and clip. - Ergonomic comfort grip - Easier to pick up - Easy to use - Keeps ball mount bar safely in place - Black comfort grip on both pin and clip - Always keep extra pin and clips on hand for safe towing