This brass lock works great for many of the steel restraints and locking leather restraints that we carry. All are keyed alike, which is a huge advantage if you lose a set of keys. Example: If you order more than one all locks will be keyed a like. ABUS locks use a precision pin tumbler cylinder and is made of non-corrosive materials for durability. Self-locking: it can lock without a key by pressing down the shackle.