Balancer identification

Hello, thank you for posting,

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. 

If there are not any markings, you will need to obtain the weight of the window sash and refer to the strength chart on the product page to choose the correct spring strength stamp option for your window. Please review and let us know if you have any additional questions! 

Comparison of the S378, S380 and S385 balance shoes.