This refers to locks and their accompanying circular keys that are often used on bicycle locks, vending machines, and electrical devices. “Ace” and “Kryptonite” are two common brand names associated with this technology. Such locks can also be found on Harley-Davidson motorcycles, Laundromat washers, showcases and countless other devices. Generally, these keys can be copied by most locksmiths; in many cases, keys can also be fitted when the need arises.