Sometimes you want a door to look locked without actually being locked.

Useful with those electronic keypad locks but you don't actually want them locking the door because you'll be right back, or you want someone to use the door without giving out the code.

Magnetically sits in the strike plate.  Use a 8x3mm magnet.

Rev2 may be used when you need a wider area for the door deadbolt to mate with, sand as desired to allow the door to stay closed and be pulled open, but without actually locking.

Use supports in the underside indent and remove with a hobby knife.