Make your tow vehicle and trailer more secure by keeping them locked up tight with the 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. The CURT Hitch Lock allows you to lock your ball mount into your trailer hitch, deterring theft and preventing anyone from detaching your trailer at the ball mount. This CURT hitch lock features a barbell design with a stainless finish and comes with a 1/2" pin diameter and a 5/8" diameter adapter sleeve. This allows it to be used on either a 1-1/4" or 2" receiver tube. The CURT barbell hitch lock is comprised of a pin with two end caps and a round locking mechanism. This key-operated lock is activate with a simple 1/4 turn. It includes a watertight dust cap to keep out the elements and prevent corrosion.• 1/2" diameter pin fits 1-1/4" receiver tubes• 5/8" adapter sleeve allows mounting in 2" receiver tubes• Stainless steel construction for lasting rust resistance• Easy-to-operate 1/4-turn lock activation• Watertight dust cap prevents internal corrosion• Includes 2 keys for added convenience Stainless steel construction for rust resistance Watertight dust cap prevents internal corrosion Includes 2 keys for added convenience | Curt 1/2" Hitch Lock with 5/8" Adapter