Emily from SWISCO responded:
March 1, 2022
Hello! Your outer tube's diameter looks to be 5/8", so we recommend the S600-29 with the red tip option, which supports a sash weight of 7 to 29 pounds. You may want to weigh your sash on a scale and refer to the chart under the product description on the S600-29 store page to confirm that this option is appropriate for your sash. |