Kryptonite Keeper Standard 12mm U-Lock Bicycle Lock with FlexFrame-U Bracket

12mm Hardended Steel Shackle Resists Hand Tools, Bolt Cutters, and Leverage Attacks<br>Interior Locking Dimensions; 4" x 8"<br>Key Safe Program; Kryptonite will ship your first 2 keys for free, globally, in the event you lose them.<br>Anti-Theft Protection Offer; Up to $500 Reimbursement<br>Lifetime Warranty