The Tri-Circle Combination Padlock (Model ZH40) is a keyless locking solution designed to provide reliable security for various applications. This padlock uses a four-digit resettable combination mechanism, eliminating the need for carrying or managing physical keys, which is a major convenience for lockers, gym bags, toolboxes, and travel luggage. The ZH40 model typically features a sturdy, solid brass body and a hardened steel shackle, offering good resistance against cutting and prying attempts. The combination mechanism is easy to set and reset, making it a flexible and essential item for securing personal belongings.