Kryptonite Evolution Series U-Lock - 2.75 x 5.9"Secure disc style cylinder resist picking and drilling Short crossbar and shackle create a compact fit providing better security Hardened double deadbolt design gives additional protection against twist attacks Lightweight at 747 grams Shackle is 11mm hardened MAX Performance steel Features DuoCore hybrid cylinder technology to provide increased security High security Bent Foot design for ease of use Includes three Stainless Steel keys with new key