16mm shackle. Sold Secure Gold and VDS Class B+ approved. Maximum security U-lock for high theft areas. Extra thick 16 mm case-hardened Kryptonium steel shackle resists cutters and leverage attacks. Cross bar is shielded by a hardened Kryptonium steel sleeve in a double crossbar design for double security. The Kryptonite New York U Lock has a high security anti-pick disc-style cylinder with patented double deadbolt lock. Flat key with integrated sliding dustcover protects the cylinder. Supplied with bracket for carrying on the bike. Approved to Gold Sold Secure standard.