block and tackle window balances

With this combination of attachments, you could have either an S380 or S385 channel balance. You need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. Once you've chosen the correct balance, choose the length and corresponding stamp option for each on our product page. The letters in your stamps are placeholders for the numbers shown on our product pages. 

Ex. 22E would be a 2250 option. 

Thank you and let us know if you have any other questions or concerns.

Comparison of the S378, S380 and S385 balance shoes.