The Abus Ultra 410 Lock Combo is a U-lock combination bike lock that lets you customize your number so you can leave your bolt cutters behind. Plus, the hardened steel shackle is 12mm thick, making it probably too hard to cut off anyway. Which is exactly what you're looking for in a bike lock (unless you're prone to forgetting your code). Keep your bike exactly where you left it with this bike lock at your service. Features of the Abus Ultra 410 Lock Combo 12 mm, hardened steel round shackle The shackle, the case as well as supporting elements of the locking Are made of specially hardened steel Ergonomic shape allows best handling Two component molded digits guarantee life-long visibility IndiviDually settable code 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