The 65 padlock in sizes 20 and 25 mm is mostly used to secure bags, luggage, cash boxes, etc. while the size 30 - 60 mm locks work best on chains, doors, gates, cabinets, lockers, tool boxes, cellar windows, etc. The 65 features a lock body made from solid brass and a shackle made from hardened steel with NANO PROTECT™ coating for extra corrosion resistance. The 65 padlock is self-locking: It is locked automatically by pushing down the shackle - no key is needed.