Made of high‑quality iron and aluminum alloy, with special coating, , rustproof and weatherproof. The U-shape lock can resist picking, prying and drilling. Works with most caravans and trailers with 50mm tow balls as standard. The Lock fits 1-7/8Inch, 2Inch, 2-5/16Inch couplers and ratchet is adjustable with 10 locking positions. It is easy and quick to install and remove,and bright yellow color can provide high visibility.<br><br>Each lock is supplied with 2 keys. Guards against theft of caravans & trailers. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:As Shown Material:aluminum alloy<br><br>Package Contents: 1 x Trailer Lock<br><br>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.