These mortise locks are the standard at most 3-4 star hotel/Motels across the USA. If you've stayed in one over the last 20 years then you've probably seen the unit on your suite door that you insert the access card into and the door unlocks. Well this is the lock that sits inside the door in most applications. This is definitely a must have stock item for any engineer or maintenance personal in these establishments as they are notorious for putting up with daily abuse from unruly guests and kids alike.