Cotterless clevis pins are a solid pin with a detent ball that eliminates the need for a cotter pin as the ball pushes inside the pin while it goes through the hole and then pops out on the other side of the hole, sucuring the pin in place. Clevis pins are used in place of bolts and rivets where something needs to be held in place but not permanently. A They are made from low carbon steel and zinc plated for mild corrosion resistance.