Caldwell balance

A quick learner says:

The metal is 29" long and I am looking 8 of these

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Emily from SWISCO responded:

Hi there!

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. You'll also need a spring strength option of 2830.

If you have any further questions just let us know.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A quick learner says:
so what are the options 2810 2820 etc.?
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Emily from SWISCO responded:

The stamp on your metal channel is "28 3" which represents the weight your sash holds. So, you'll need to choose the 2830 option. 

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