4mm glass + 18mm frame + 4mm glass + 18mm frame + 4mm glass (4/18/4/18/4)

4mm glass + 18mm frame + 4mm glass + 18mm frame + 4mm glass (4/18/4/18/4) windows glass glass-packages 3-glass 4-18-4-18-4

4mm thick glass / 18mm wide spacer / 4mm thick glass / 18mm wide spacer / 4mm thick glass.

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