New York U-Lock provides ultimate security for high-theft areas and urban college campuses. Extra-thick shackle is made from 5/8-inch Kryptonium steel. Patented deadbolt locking mechanism is located on the bottom of crossbar for added security. Shortened crossbar limits thieves' methods of attack. Includes BracKIT and a built-in cylinder dust cover. One year free optional $3000 guarantee offer.