The 82 monoblock brass padlock can be used in spaces that are hard to access, e.G. On roller shutters and it 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. A hardened steel pin combats the most common ways of forcing the lock open. A key is not needed to close this lock. It gets closed automatically by pushing down the shackle.