Features: Heavy Duty Steel: Made from 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. High Visibility: Comes with a yellow warning Label with high visibility, so you can easily notice if it's still in place and remind you to removes it if you want to hook it up. Anti Theft Lock: Trailers King Pins lock using plum lock, not easy to damage, more durable; Comes with 2 keys, so you can keep one as a spare. Easy 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 King Pins lock is securely installed. Universal Fit: King Pins lock is widely used for truck companies, RVs dealers or fleet drivers, and used for RVs, boats and campers semi truck. Specifications: Material:Stainless Steel Height:85mm/3.3mm Internal Diameter:75mm/2.95'' Universal fit for 50mm diameter trailer pins Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x 5th Wheel King Pins Lock