The Simson Sure Ring Lock is a very strong lock suitable for virtually any bicycle frame. This lock is ART2 approved, making it approved for almost every bicycle insurance policy. It can be mounted to the frame tube with the Simson Ring Lock Mounting Set or with top bolt mounting. It comes with two keys and offers the option of ordering additional keys. Important! If the key to an ART-approved lock is lost or stolen, you must notify your insurance company. Product specifications: - ART-2 Ring Lock - Universal - Easy to install - Primary base color: Black - Type: Sure - Locking type: Key - ART Approval Mark: ART2 - Suitable for mortise locks: No - Protection level: No level indication