Don't let your trailer become a target! This upgraded heavy-duty lock is built to protect your investment. It's specifically designed for trailers with a 2 5/16 inch spherical hook coupler (please double-check your coupler type and size before ordering - it fits A-frame and adjustable couplers). The lock is made from super solid, hardened steel that's seriously tough to cut or smash. The whole thing is coated in a durable black powder coating that fights off rust and corrosion, so it can handle the weather. It completely covers the coupler's ball, blocking access and making it a huge deterrent against theft. The drill-resistant lock cylinder adds another layer of security. Installation is pretty straightforward with the included instructions - you just slide it on and lock it up. It gives you real peace of mind when you have to leave your RV, boat, utility trailer, or off-road vehicle unattended. The manufacturer even backs it with a 5-year warranty, which is awesome. Sleep better knowing your trailer is locked down tight with this beast of a lock.