Kryptonite KryptoLok Standard U-Lock + 4 foot Kryptoflex Cable Sold Secure Gold Promoting increased security and alleviating the worry of theft is Kryptonite's KryptoLok Standard U-Lock + 4-foot Kryptoflex cable, with Sold Secure Gold rating. Excellent in moderate level crime zones this lock will offer ease of mind when making a quick stop or leaving your bike for a couple of hours. Reinforced with a 12.7mm hardened performance steel shackle that securely fits in the double deadbolt design, the KryptoLok is highly effective against twist, leverage and cutting attacks. An excellent deterrent against theft. With additional security against the more creative attacks, the disc-style cylinder ensures resistance against picks and drills. Kryptonite has made sure that the integrity of this lock remains intact all year round, by using a protective vinyl coating, a dust cover for the keyhole and stainless steel components. In fact, they're so confident in this lock they're offering a bonus lifetime warranty. Leaving you with less hassle, the FlexFrame-U bracket means that you can mount this lock to a variety of places on your frame, meaning, less luggage to carry on your rides. And for your convenience Kryptonite will replace up to two keys for free when you register with their Key Safe Program, always an extra bonus for those of us who are a little clumsy.