Sturdy and durable material: our trailer coupler padlock is made of zinc alloy, the surface of the lock will have a black coating to prevent corrosion, the part of the lock is stainless steel and will not rust, it is very strong, a very practical tool that can be applied for a long time Easy to operate: this padlock-style trailer tongue lock is easy to install and simple to remove, and uses a simple 1/4 turn lock activation for convenient locking and unlocking as needed Portable size: 1/4 Inch diameter tongue lock pin with effective length 3/4 Inch, small size for easy carrying, won't take much space, keeping the coupler lock in your pocket or vehicle anywhere that is fine; Note: please verify dimension and length of the pin you want before purchasing our coupler hitch lock pin Instructions: each one of our lock is combined with 2 keys, in case of losing, you just need to insert the key and turn the key 5 - 7 times to open, and align the pin to the key hole, turn the key 5 - 7 times to lock Widely application: provides additional security for your camper, boat or trailer by securing the coupler on your trailer tongue, also secures trailer door latches, cargo boxes and other types of doors Easy to stock: Small size for easy stock, in your pocket or vehicle anywhere that is OK. Two keys: For your convenience, two keys are included with this trailer tongue lock, you can keep the spare key in a discrete location for emergencies or give it to a friend for helpful. Note: The style of the key is random and cannot be selected Material:Aluminum alloy colour:Black Package Contents: 2 x Trailer lock 4 x Key