The 55 padlock offers basic protection. In sizes 25 - 35 mm it is used to secure bags, luggage, caskets, cash boxes, etc. while in sizes 40 - 60 mm it can secure doors, gates, cabinets, lockers, tool boxes, cellar windows, sheds, etc. The 55 features a body made from solid brass and a shackle made from hardened steel. This padlock is self-locking which means it is locked automatically by pushing down the shackle - no key is needed.