Measurement of door rail thickness

A quick learner from Florida says:
I need a replacement for a sliding glass door handle with lock. I found one on this website that looks like it may work but I am unsure about the door rail thickness specification. Can you elaborate on what the door rails are or how to measure the door rail thickness. Thank you!!!
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Dave Sr. from SWISCO responded:
The 82-055K is for a door thickness of 1", maybe 1-1/4" but no thicker. Open your door and lay a ruler flat up against the edge of the door to determine its thickness.
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