CURT Trailer Hitch Lock, 1/2-Inch Pin Diameter, Fits 1-1/4-Inch Receiver Model 23501CURT Trailer Hitch Lock, 1 2 Inch Pin Diameter, Fits 1 1 4 Inch Receiver Model 23501 Make your tow vehicle and trailer more secure by keeping them locked up tight with a CURT hitch lock. Like a hitch pin and clip, a hitch lock is designed to insert into the fastener hole in the side of a receiver tube in order to hold a ball mount or hitch mounted accessory in place. While a CURT hitch pin does offer sufficient strength for keeping your ball mount