3/4 Inch x 6-1/4 Inch Zinc Plated Yellow Steel Forged Hitch PinHitch pins join equipment and parts that require a temporary connection or frequent disconnection and reconnection. They have a shaft that fits through a predrilled hole and a clip, cotter pin, or other mechanism that locks the shaft in place. Large hitch pin sizes are commonly used on vehicles to secure a trailer ball mount to a receiver hitch. Ring pins (also called cotterless hitch pins) have a spring loaded ball locking mechanism in the shaft