1UNIVERSAL COUPLER LOCK: This trailer coupler lock features a 1/4in diameter pin and padlock design for a latch type coupler with a maximum span of 3/4in. 2RELIABLE STRENGTH: The trailer lock is made of high strength zinc alloy and is protected from the elements with a lacquer finish, while the coupler lock is corrosion resistant with a durable galvanized layer, increasing the service life and safety of the coupler lock. 3Highly Secure: Our trailer padlock features a robust and intimidating design, ensuring maximum protection against theft for your valuable trailer. 4EASY TO USE: Easy to lock and unlock with a simple 1/4 turn lock activation, just turn the flat key 5 to 7 times to open or close our hook locking pin. 5VERSATILE USE: This lock key set is suitable for tugs, RVS, trucks, cars, toolbox, etc. You can use it freely to meet your different needs. 1 x Lock 2 x Key