CURT Right-Angle Trailer Hitch Lock, 1/2-Inch Pin Diameter, 5/8-Inch Adapter, Fits 1-1/4 or 2-Inch Receiver Model 23506CURT Right Angle Trailer Hitch Lock, 1 2 Inch Pin Diameter, 5 8 Inch Adapter, Fits 1 1 4 or 2 Inch Receiver Model 23506 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