Master locks work 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. 1/4″ sized lock made of solid brass. Master locks incorporate a pin tumbler mechanism and have a Master lifetime guarantee. For a value deal check out our 4pk of masterlocks (see related items below).