This is a replacement lock cylinder for BOLT Toolbox Retrofit Kit, #7023548. Uses your stock key, so you don't have to carry around another. Just insert your factory key, turn once, the lock learns that key and you're done. Weatherproof with automotive grade stainless steel lock shutter keeps out weather and debris. 6-plate tumbler sidebar prevents picking and bumping for a smooth operating lock that Bolt backs with a limited lifetime warranty. Retaining nut sold separately.