Product Description12mm six-sided, chain links made of 3T HARDENED MANGANESE STEEL for maximum strength. Durable, protective nylon cover with hook-n-loop fasteners to hold in place. Includes Evolution series 4 Disc Lock with 14mm MAX-PERFORMANCE STEEL SHACKLE. Patented*, oval hardened STEEL CROSSBAR for extra security. Hardened DOUBLE DEADBOLT locking for extensive holding power. HIGH SECURITY DISC-STYLE CYLINDER with reinforced anti-drill, anti-pull protection system. SLIDING DUSTCOVER protects and extends cylinder life. 3 STAINLESS STEEL KEYS - one lighted with high intensity bulb and replaceable battery. Product dimensions: 3.25? (100cm) chain length, 14mm shackle diameter.Amazon.comBig city riders need big city protection, as would-be thieves aren't intimidated by just any lock. Enter the Kryptonite New York 1210, a high-security lock with an innovative oval crossbar disc build designed to defeat thieves' toughest attacks. The New York 1210 is equipped with a 12mm, six-sided chain made of 3t hardened manganese steel for maximum strength. The chain is tough and intimidating, with a durable protective nylon cover that includes hook 'n' loop fasteners to hold it in place. The New York 1210 also includes the Evolution Series 4 disc lock and 14mm Max-Performance steel shackle. The lock's high-security disc-style cylinder--which offers more than one million key variations--boasts a patented, oval-hardened steel crossbar for extra security. The New York 1210 offers such additional security-enhancing features as hardened double-deadbolt locking for extensive holding power, a reinforced anti-drill/pull cylinder protection system, a sliding dust cover that protects and extends the cylinder life, and three keys--one of them lit with a high-intensity bulb and replaceable battery. Ideal for anyone who lives in moderately high crime areas, the New York 1210 boasts a 10 ranking on the Kryptonite 1-12 comparison system, which ranks the varying levels of security within the company's product range. A lock that ranks 1 on the Kryptonite scale might work if you live in the burbs and have a Rottweiler parked next to your bike or motorcycle. However, city dwellers demand extreme protection, which is why the New York LS is built for serious deterrent security. The Legendary Durability of Kryptonite Locks The first big test for Kryptonite locks came in 1972, when Kryptonite founder Michael Zane directed the Second Avenue Bicycle Shop in New York City to lock a three-speed bicycle to a signpost in Greenwich Village. Although thieves immediately stripped all of the bicycle's removable parts, the bicycle itself remained for 30 days and 30 nights. The Kryptonite lock and the bike frame were still in place, even though the lock had been attacked numerous times. The publicity gave Kryptonite the boost it needed and forever changed the face of bicycle security. Twenty-two years later, Kryptonite returned to the streets of the Big Apple to test its latest innovation, the New York lock. In April 1994, the New York Post laid down the ultimate challenge: Could Kryptonite's New York lock last 48 hours on the toughest streets of New York? In a city where more than 100,000 bikes are stolen each year, Kryptonite and the Post locked a brand-new, bright green Univega road bike worth $600 to a parking meter in the East Village--the Bermuda Triangle of New York bicycle thievery. For a full 48 hours, the bike remained locked on the corner of Avenue A and 11th Street. Zane and Neil McDaid, director of product development and design for Kryptonite, watched from around the corner as the bike came under every possible means of assault, stumping thieves at every turn. After 48 hours the bike remained intact except for the gear derailleur, which had been stripped off. The lock showed definite signs of abuse, but it had not failed. The New York lock had met the Post's challenge. Not satisfied with the length of the test, Zane moved the bike to SoHo for ano