Kryptonite Evolution Series U-Lock Provides High Security We all know you love your bike, so make sure you lock it up if you leave it unattended. U-locks provide excellent protection and deter thieves from trying to get your bike. The Kryptonite Evolution Series U-Lock has a secure disc-style cylinder that resists picking and drilling. The short crossbar and shackle create a compact fit providing better security. Hardened MAX-Performance, 13mm steel shackle resists bolt cutters and leverage attacks. The Transit Flex Frame Bracket system fits on the adjustable spline and allows for multiple off-set fitments to better align the lock for transportation. This lock includes three stainless steel keys and features a security rating of 7 out of 10. Features Secure disc-style cylinder resists picking and drilling Short crossbar and shackle create a compact fit providing better security Transit Flex Frame Bracket system fits on the adjustable spline and allows for multiple off-set fitments Specifications Shackle Length5. 5" / 7" / 9"U-Lock Diameter13mm Shackle Width3. 25" / 3. 25" / 4"Cable Included No Lock Style Keyed Security Rating7 out of 10Weight3. 15 lbs | Kryptonite | Evolution Series U-Lock 3. 25 X 5. 5"