Nilight Trailer Hitch Lock Pin 5/8″ Locking Receiver Hitch Pin Keyed Unique Weatherproof Anti-Theft Lockable Fits 2″ 2-1/2″ Receiver Extra Long 3-1/4″ Span Tow Truck Boat Bike Truck, 2 Years Warranty in high quality. A separate spring clip (cotter pin) provides additional safety, can use the locking pin with or without the lock mechanism. R spring clip (cotter pin) MUST be inserted into pin hole when use this lock.