Protect your dual propane tanks with our easy-to-install lock - no tools required. In about a minute: 1. Apply the two included nuts and tighten.2. Place our propane lock over the nuts.3. Apply our high quality pad lock. You're done! MADE IN USA For use with dual propane tanks High quality pad lock with 2 keys Made of solid welded steel | Battery Shackle /splash001 Ent LLC Dual Propane Lock Made in USA