2840 Number on Window Balance 23-28 lbs Sash Wt. 60-284

2840 Number on Window Balance. 29" Length of Metal Channel. 23-28 lbs Sash Weight. 1/2" x 1/2" Non-tilt window channel 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.