3940 Number on Balance 24-30 lbs Sash Wt. Part Number 60-394

3940 Number on Window Balance. 40" Length of Metal Channel. Sash Weight 24-30 lbs. 1/2" x 1/2" Non-tilt window balance.
***Note: Top and bottom balance ends must be ordered separately. We strongly suggest replacing the sash guides on the side of your window as well.