Originally Posted by OldCoot
I've never seen a sliding GARAGE door mounted in plastic.
Maybe your confusion stems from a narrow definition of a GARAGE door.
Try this one: "a door that rotates on a horizontal axis and is supported horizontally when open Sometimes shortened to overhead"
So this engineering marvel is a horizontal
spindle with a sheet of wood slats glued to
a fabric backing and attached to the spindle. The assembly is supported on both sides with a moulded plastic end cap and track.