Keyed different hidden shackle padlocks restrict access to property and have a shackle that is fully concealed within the padlock body. They're more resistant to cutting and prying compared to other padlocks, so they provide the highest level of security of all shackle types. These padlocks are typically used on fences and vehicles to secure access to goods. They're keyed different, meaning all padlocks open with different keys, which limits access to a single user.