These locks are ideal for bondage gear. All of these padlocks are keyed alike, so you'll never have to worry about if your keys are for the right lock. You'll get 2 keys with each lock. The 1/4" lock is made of solid brass. It incorporates a 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.