Stank window balance

Thanks for writing in! Your channel balance appears to be the Series 770 Balance. Since your metal channel is 30", you'll need the S770-30. 

To confirm the stamp option needed for your replacement balances, you'll need to look for any stamps/markings on the channel. 

If there are none, or you cannot cross-reference it with the stamps on our website, you'll need to obtain the exact weight of your sash. There is a chart that lists the weight range each stamp option can hold to support the weight of the sash.