
In the Low Profile design, the door bottom is mortised into the core of the door, so there is no gap on the door face.

Screws and fasteners are flush with the door face.
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In the Standard design the door bottom is semi-mortised into the push side of the door face with more of an industrial look.

The extension of the door bottom shows a gap on the door face, and the fasteners sit exposed on the outside surface.
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