Listen up trailer owners - security matters! This heavy-duty hitch lock is built specifically for 2 5/16 inch couplers (make sure that's your size before buying!). It's made from reinforced hardened steel that resists cutting, prying, and impacts - basically thieves' worst nightmare. The core is brass which makes it pick-resistant, and it's got this cool hockey puck design that covers the whole coupler opening. Comes with THREE keys so you can keep spares (because losing the only key is the worst). The red coating isn't just for looks - it helps resist rust and corrosion, so this lock can handle rain, snow, sun, whatever Mother Nature throws at it. Installation is stupid simple: just slide it on and lock it. Removal's just as easy when you have the key. Peace of mind for your RV, boat trailer, utility trailer, or pickup. Don't risk it - lock it down.