Krytonite`s lightest weight U-lock option at 730 grams 39% lighter than the Evolution Mini-5. 11mm hardened New Max-performance steel shackle material allows reduction of shackle diameter while maintaining the performance standards of the Evolution Mini-5 Mini-7 & Mini-9*. New patent pending Bentfoot double deadbolt design. Higher security disc-style cylinder is pick and drill resistant. Reinforced cuff over crossbar and cylinder for extra security. 3 Stainless Steel keys – including new key design and one LED replaceable key fob