These receiver locks from BOLT feature a solid zinc core, an automotive-grade cylinder with a patented 6-plate tumbler sidebar to prevent picking and bumping, and a stainless steel lock shutter to help keep out dirt and moisture. They're also equipped with a rugged jacket and cap. BOLT receiver locks are ideal for helping you secure your hitches by conveniently using your ignition key. That means you won't have any extra keys to carry or lose and that you'll have the convenience of always having the right key.