The BOLT„¢ (Breakthrough One-Key Lock Technology) Series of locks are the World€™s First Codeable Locks. Its only padlock that will work with your vehicle key. Can be programmed to match camper, trailer, tree stand or any key, and then program them all to match your one vehicle key. Add a lock at any point without worrying about keyed-alike sets €“ you already OWN the key! Exclusive automotive grade, stainless steel, weather resistant shutter keeps out dust and dirt and has been awarded ASTM€™s highest corrosion resistance rating. Unique 6-plate tumbler sidebar makes it nearly impossible to pick or bump. Rugged jacket seals out elements and protects your gear. Standard 9/32€ nickel plated, hardened steel shackle. 2" x 1-1/8" inside shackle clearance. USA made.