- Works with Perma-Shield Narroline Double-Hung (non-tilt) windows manufactured from 1968 to Present.
- Works with 400 Series Tilt-Wash Double-Hung windows manufactured from 1994 to Present.
- Used for replacement window installation. This clip is attached to the window jamb then bent over and attached to the stud next to the window.
- Use at least 4 clips per window.