The Monobloc 92 is a sturdy brass lock with a steel jacket for extra protection. The lock can be used in spaces that are hard to access, e.g. on roller shutters, but it also works perfectly in combination with a security chain. The lock's shackle is made of hardened steel with NANO PROTECT™ coating for extra corrosion resistance. This padlock is key-retaining which means that the lock retains its key until it is fully locked.