The CURT Coupler Lock is designed to add security to your trailer and towing equipment. Instead of merely retaining the coupler latch mechanism, it locks it into place and greatly deters any tampering and theft of your trailer while it's coupled to your vehicle. The CURT Coupler Lock is key-operated and comes with two keys for convenience. This coupler lock features a compact design to keep the pin well protected from tampering. It comes with a brass finish and offers a 1/4" pin to fit a max span of 3/4". All CURT coupler locks are made to fit latch-type couplers.• 1/4" pin fits latch-type couplers with a max span of 3/4"• Hardened steel locking pin for reliable security• Protected by a durable brass-plated finish• Easy-to-operate, 1/4-turn lock activation• Includes two keys for added convenience 1/4"" pin fits latch-type couplers with a max span of 3/4"" Durable brass-plated finish & hardened steel locking pin Includes two keys for added convenience | Curt Coupler Lock, 1/4" Pin