1Heavy Duty Steel: Made of heavy steel, welded structure, durable and difficult for thieves to pry open. Improves safety when mounted on the trailer. Rust and corrosion resistant, weather resistant. 2High Visibility: Comes with a yellow warning tag with high visibility, so you can easily notice if it's still in place and remind you to remove it if you want to hook it up. 3Anti Theft Lock: Trailer king pin lock using plum lock, not easy to damage, more durable; Comes with 2 keys, so you can keep one as a spare. 4Easy to Use: You simply snap the lock onto the trailer hook, then insert the key into the lock core and turn it 180 degrees, and the kingpin lock is securely installed. 5Universal Fit: King pin lock is widely used for trucking companies, RV dealers or fleet drivers, and used for RVs, boats and campers semi truck. 1 x Trailer King Pin Lock withCautionTag 2 x Key