Protect your shiny new bike from nefarious characters with the Kryptonite KryptoLok STD U-Lock, made with 12.7mm of hardened back-the-heck-off. 12.7mm Hardened Performance Steel Shackle Resists cutting and leverage attacks. High Security Disc-Style Cylinder Pick and drill resistant. 4" x 9" (10.2 cm x 22.9 cm) Includes Flexframe-U Bracket Transportation system which allows for versatile carrying. 2 Stainless Steel Keys Ergonomic design to reduce the amount of torque, and keep them from bending or breaking.