10mm six-sided chain links made of 3T manganese steel- Patent pending end link design secures chain to hardened deadbolt- Patented, reinforced oval crossbar lockhead- High security disc-style cylinder is pick and drill resistant- Sliding dustcover protects and extends cylinder life- Durable, weather resistant nylon sleeve prevents scratches- 3 stainless steel 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 4