Channel balance

Quick Learner from San Francisco
This for a non tilt window. Metal piece measures 22 in linguistic and it's about 1/2 in wide I think the marking says BSI 2010 smooth edges. Can you advice what's comprable
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Emily
Emily from SWISCO
SWISCO
Expert

Hi there!

With this combination of attachments, you could have either an S380 or S385 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 2110. 

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.
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