Window balance

Hello!

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 remove and weigh your sash to choose the appropriate spring strength option. There's a chart on the S380 and S385's product page that'll show you which option you need based on the weight of your sash. 

If you have any further questions just let us know!

Comparison of the S378, S380 and S385 balance shoes.