Window balance

A home owner from Parrish FL says:
This channel balance fell out of the frame of my window. It is identified with a stamp of 28B USA. It measures 29 inches long metal end to metal end. The marking is not visible in a photo.
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Emily from SWISCO responded:

Hello!

With this combination of attachments, you could have either an S380-29 or S385-29 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. A "28B" stamp usually corresponds to our 2820 stamp option but you can always weigh your sash on a scale to be certain.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A home owner from Parrish FL says:
This email has been very helpful but a little late. I will order the required channel balance but will need to return the 8 I ordered when on the website.
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Emily from SWISCO responded:

You can see our return policy here

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