Kryptonite Kryptolok Standard Bike U-Lock, Heavy Duty Anti-Theft Bicycle U Lock

12.7mm Hardended Performance Steel Shackle Resists Hand Tools, Bolt Cutters, and Leverage Attacks
Interior Locking Dimensions; 4" x 9"
Key Safe Program; Kryptonite will ship your first 2 keys for free, globally, in the event you lose them.
Anti-Theft Protection Offer; Up to $1,750 Reimbursement