I really like the look of the layered Window Frames and decided to make a list of all the measurements of the the layers and leave it in the case that holds it. As long as I remember to open the case and pull the list out I won't have to measure it again. Here's a sample of what the layers look like.
The smallest Window Frame ( will refer to as frame 1) layers with a 1-1/8" sqaure
Frame 2 layers with a 2" sqaure
Frame 3 layers with a 2-1/2" square
Frame 4 layers with a 2-7/8" square
Frame 5 layers with a 3-3/8" square
Frame 6 layers with a 3-7/8" square
Hope this list will be useful to you and maybe even save you a minute or two looking for a ruler! If you don't have the Window Frames framelits yet you can order them through my online store and remember you receive a FREE spool of the 3/8" Stitched Satin ribbon with every $40 purchase. Sweet deal and another good reason to shop!