The Hillman Group The Hillman Group 4257 Cotterless Hitch Pin 3/8 x 2-1/8 In. (4-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