9mm four-sided chain links made of 3T manganese steel- Hardened deadbolt design- Patented, reinforced oval crossbar lockhead- High security disc-style cylinder is pick and drill resistant- Durable, weather resistant nylon sleeve prevents scratches- 2 ergonomic "I" keys plus Key Safe Program for replacement keys- Lifetime warranty- Anti-Theft Protection Offer: with a paid registration, registered owners can be reimbursed in the event of theft due to the opening or breaking of the lock by forceSold each, case qty 2