The Kryptonite New York Long Shackle D Lock is an 16mm hardened MAX-Performance steel shackle. Patent pending hardened double deadbolt design gives additional protection against twist attacks. To add to its amazing security, it features a disc-style cylinder which is pick and drill resistant. All these tough features are covered in a protective vinyl coating and a sliding dustcover protects the cylinder from the weather elements. Gold Sold Secure, this lock will have your back and keep your bike safe and sound.