Hale - Door standard door models can only squeeze together down to 1 3/8". For thinner doors, we recommend adding a Buildout.
Buildouts are used to fill in gaps that may be left between the door model and a thinner door or to adapt the door model to work in a pane of glass.
Note: The total combined thickness of your Buildout and your door should be between 1 3/8" and 2".