Atrium window springs

Hello,

We'd be happy to help but we'll need to see the nylon attachment at the other hand of the balance as well to identify the correct replacement for you. The stamp on the balance indicates the spring strength that you'll need to keep the window raised. If the balance in your picture is from a different sized window that the ones that you're purchasing replacement balances for, you'll also need to weigh the sashes to make sure that the balances are calibrated properly. Thank you.