A BIKE LOCK AS STABLE AS A FORTRESS There is no way around this U-lock. The Ultra 410 shows how security works in ABUS quality. If you don\\\'t want to leave anything to chance when protecting your bike, our Ultra 410 is the best choice. Its solid shackle made of hardened special steel, with a diameter of twelve millimetres, withstands many brutal attacks. The solid lock body is also made of steel and contributes to the protection of your bike with its high-quality locking cylinder. Technology: Hardened 12 mm round shackle The shackle, body and the structural parts of the locking mechanism are made of specially hardened steel The special, modern design of the lock body casing allows for optimum handling High-quality locking cylinder for a high level of protection against tampering, e.g. picking Operation and use: Good protection at medium theft risk Recommended for securing good bicycles The longer the shackle, the easier the bicycle can be locked to a fixed object