1. Made of high quality aluminum alloy, rust-proof and corrosion-resistant, sturdy and 2. This lock prevents theft of your truck or trailer. 3. Installation and disassembly are quick and easy. 4. Comes with 2 keys, suitable for most stamped steel and cast tie rods. Product name: Hook lock Model: YH1744 Scope of application: universal size for 4. 76 cm, 5. 08 cm and 6.99 cm couplers Type: Car security lock Colour:red Material:Aluminum Alloy Package Contents: 1 * Hook lock 2 * keys Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.