Kryptonite Evolution Mini-5 pin lock with key locking mechanism.13 mm hardened steel horseshoes Disc lock offers high level of security Transit Flex Frame-U system for attachment to bike frame Vinyl finish, No scratches on the bike frame 3 keys supplied with the lock (1 with backlight) Key Safe program (a new key can be ordered) Dust and moisture protection Shock and noise protection Level of protection 7 out of 10 Diameter 13 mm Dimensions: 8.3 x 14 cm