> it helps if you have two locks Thieves generally carry either an angle-grinder or a bolt-cutter, but not both. Angle-grinders work on D-locks, but not on cha

> it helps if you have two locks Thieves generally carry either an angle-grinder or a bolt-cutter, but not both. Angle-grinders work on D-locks, but not on chains. Bolt-cutters work on chains, but not D-locks. If you use one of each, the chances are the thief will steal someone else's bike instead.