This is the Backer for the Guardian upgraded Sheath.
You would purchase the Backer if you want to install a single Molle Lok on center line of the Guardian sheath. This would be for PC mount, Pack mount or Molle Belt.
This does not come with the Molle Lok but does come with hardware to attach to the sheath and molle lok.
You can source the molle lok from Blade Tech or on Amazon.