ASP replacement lock sets allow you to replace damaged ASP locks or convert your current handcuffs. ASP lock sets are easily removable and are interchangeable with chain, hinged, or rigid ASP handcuffs. You can convert standard handcuffs into high security or training, etc. The lock sets are color coded for easy identification. Standard 1 pawl locks are yellow (ASP81237). High security locks that require a special key are blue (ASP81238). European 3 Pawl (ASP81239) use standard handcuff key. Sold per each- you need 2 lock sets to convert 1 pair of handcuffs. Keys not included.