The Hillman Group The Hillman Group 4256 Cotterless Hitch Pin 3/8 x 1-5/8 In. (3-Pack) Cotter less hitch pins are low carbon pins with a ball locking mechanism an easy grip pull ring Cotter less hitch pins are self-locking and reusable Low Carbon Steel Material An easy grip pull ring and are easy to insert and remove for quick disconnect applications