Because you love your ORTLIEB bags, we&&';;ve designed a reliable lock to keep them securely attached to your rack and prevent accidental removal. This specially developed lock is compatible with all Quick-Lock2 systems, providing an extra layer of security for your gear.Designed to fit standard racks up to 16 mm in diameter, the lock remains open after unlocking, ensuring it doesn&&';;t interfere with attaching or detaching your bag. It installs easily onto your Quick-Lock system-no tools required.For added security, optional anti-theft devices (E124/E125) for QL2.1 bags can be used to secure the roll-top closure or other items such as helmets. For even more convenience, the lock is also available in a keyed-alike version with two identical keys.