1、Sturdy Construction: Made of aluminum alloy with welding structure, the pin lock provides enhanced durability , high strength and oxidation resistance with electrostatic treated finish. 2、High Visibility: The 5th wheel lock is equipped with a warning tag to help you remember whether it's still attached and to remove it when you're about to hitch, adding to its utility and convenience. 3、Enhanced Safety: The anti theft lock is difficult to break or pry open, significantly improving the safety when installed on your trailer, helping to reduce the chances of theft. 4、2 Keys Included: The security pin lock comes with two keys, so you can keep an extra as a spare. This means you have a backup plan in case you lose your primary key. 5、Easy to Use and Versatile: You just need to buckle the lock to the trailer hitch, insert the key into the lock core and rotate it 180 degrees to firmly install the pin lock. It's suitable for use on RVs, boats, campers, and semi trucks. Item Type: Trailer 5th Wheel Pin Lock Material: Aluminum Alloy Inner Diameter: Approx. 74mm / 2.91in Unlocking Type: Key Unlock Fitment: Suitable for RV, Trailer, Semi Truck 1 x Trailer Lock 2 x Keys 1 x Instruction Manual