20inchs

Hey there,

Thanks for reaching out! Your balances look a like our S380-20 with a 1" shoe or our S385-20 with a 1-3/32" shoe.

To determine which series is needed for your window, look over the dimensions from the diagram below to confirm the depth of your bottom shoe. Keep in mind, there is a chance that it could measure 7/8"; if so, please let me know as these will need to be a custom assembly.

Comparison of the S380 and S385 balance shoes.

Once you've confirmed the series you need, you'll need to confirm the stamp option. To do this, you'll need to obtain the exact weight of your sash. There will be a chart, below the product description of each balance, that lists the weight ranges each stamp option can hold to support the weight of a sash.