CZC AUTO Trailer Tongue Coupler Lock Adjustable Trailer Coupler Pin Lock, Dia 1/4 Inch, 3 Inch Effectice Length Fits 1 Inch to 3 Inch Latch-Type Coupler for Towing Boat Truck RV Car
CURT 23523 Chrome Trailer Tongue Coupler Lock, 1/4-Inch Pin Diameter, Up to 3-3/8-Inch Span : Amazon.co.uk: Automotive