Serious Security is the only business Kryptonite is in. They're committed to providing innovative products and programs and outstanding value. Headquartered in Canton, Massachusetts, Kryptonite is a premier manufacturer and marketer of high-quality cables, chains, U-locks and flexible security systems for the bicycle, power and snow-sports, locksmith and hardware markets. It is with great pride that Kryptonite provides Tough Locks for a Tough World to people in more than 50 countries. Kryptonite has won many awards and accolades over the years. Below are just a few of the products that are the toughest on the street.