This 12"x12" screen cutout cover is designed to cover the screen space on your enclosure.
To install:

1. Unscrew the current screen trim ring on your enclosure.
   
2. Remove the screws from your screen trim ring.
   
3. Place this piece over the screen hole
   
4. Install the screws from your screen trim ring. 
   
5. (Optional) Save your screened trim ring so you can install it again at a later date.