sheets of metal 20-1/2" square with spocket holes?

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ruleofthirds3 New Member • Posts: 21
sheets of metal 20-1/2" square with spocket holes?

Recently acquired some old equipment.  A bit confuse about 30 sheets of gold colored metal sheets with sprocket holes about 20-1/2" square.  They are about 22 or 24ga.  Assuming they are for attaching a print to for a slide appearance?  I would really appreciate any help!

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