Make your tow vehicle and trailer more secure by keeping them locked up tight with a CURT hitch and coupler lock set. This two-piece set includes a hitch lock and universal coupler lock, so whether you are towing or storing, you can keep your trailer more secure. Like a hitch pin and clip, the hitch lock is designed to insert into the hole in the side of a receiver tube to hold a ball mount or hitch-mounted accessory in place. It features a pin diameter of 5/8\" to fit 2\" or 2-1/2\" receiver tube openings. Likewise, CURT coupler locks are designed to add security to your trailer and towing equipment. Instead of merely retaining the coupler latch mechanism, they lock it into place and act as a theft deterrent for your trailer while it is coupled to your vehicle. This coupler lock features a pin diameter of 1/4\" and fits any coupler span from 1/2\" to 2-1/2\". This set of two locks also includes a universal trailer coupler lock. The universal tri-ball trailer coupler lock is engineered to be the ultimate in trailer towing security. It is highly theft-resistant and tamper-resistant, featuring built-in safety measures to keep your trailer safe. It offers security, whether your trailer is hitched up to your vehicle or left parked and unattended. This unique coupler lock has a lasso lanyard that is key-operated. It allows the trailer lock to be used while towing a trailer, keeping the latch locked in place. It can also be used in tandem with the triple ball mount to fully secure the coupler when the trailer is parked. The tri-ball is constructed from high-strength, glass-filled polymer. This blend of materials is exceptionally durable, and the orange color increases visibility to further deter tampering. The tri-ball lock fits all three industry-standard coupler and ball sizes: 1-7/8\", 2\" and 2-5/16\". For the ultimate in towing security and convenience, both locks in this lock set are keyed alike.