SEAMODE Trailer Hitch Lock Bent-pin-style trailer hitch receiver lock is used in place of standard pin and clip to prevent theft of ball mount or hitch-mounted accessory. Secure your bike rack, cargo carrier, hitch cover and more to your trailer hitch. Chrome plating resists rust. Plastic cap covers key slot to help prevent corrosion in the locking mechanism. 2 Keys included. Application : 2Inch and 2-1/2Inch trailer hitch receivers. Pin diameter : 5/8Inch.