Channel balance identification

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 to weigh your sash to determine which spring strength option you'll need. There is a chart on the S380 and S385's product page that explains how to choose your option based on the sash weight. 

If you have any further questions just let us know. 

Comparison of the S378, S380 and S385 balance shoes.