3/8" x 7/16" channel balance

A contractor from Rockwell North Carolina says:
3/8" x 7/16" channel balance 28" long
Thumbnail of the uploaded file named 28C
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Tom from SWISCO responded:

Thanks for posting. It's tough to tell what you have based on just the stamp, but I think this might be our S800-29. Can you confirm? Look over our information to let me know what you think.

I would double check the length of the metal channel. With a stamp of 28C, it should be 29" long, not 28".

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