The masterlock 900mm steel chain square links lock with integral mini u bar provides immense levels of security for your bike with a thick chain that resists cuts and saws incredibly well you can be sure that your bike is being held safely at all times the thick chain on the masterlock steel chain is measured at 09 m this allows you to safely wrap the bike lock around your bike with no issues plus the additional black nylon cover prevents any scratching on your bikes frame securit