Simply put, anyone out there looking to make a cable lock that works should take a close look at the Steeloflex.
This has a tough, armoured steel lock mechanism with folded and overlapped individual links that are over 5mm thick. It also comes with a proven key replacement service (72hrs). We've heard of a London courier who locked the Steeloflex around his waist and lost the keys, and decided he'd rather spend the next 72 hours wearing it than have the lock cut off! The Steeloflex passed our five-minute first round with minimal cosmetic damage and in test two our high-powered tool took over a minute and a half to get through this super-tough lock. This is one of the best cables you can buy.