These locks are great for the many steel restraints we carry. All are keyed alike, you will never have to fumble around to find the right key. 2 keys with each lock. Example: If you order more than one all locks will be keyed a like. 1/4" sized lock made of solid brass. Incorporates pin tumbler mechanism and is made of non-corrosive materials for durability. Self-locking: it can lock without a key by pressing down the shackle.