Kryptonite Keeper 12 standard pin cylinder lock with key locking mechanism.12 mm steel horseshoe. New, more durable DEADBOLT mechanism. Includes 2 ergonomic keys. Packaging includes a holder for bicycle locks. Protective vinyl coating. Key Safe program - free shipping of the 1st standard replacement key pair in case of key loss (registration required) Dimensions: 10.2cm x 20.3cm Protection level: 5/10.