Boy did I learn something last week. I had a couple older 10 frame deep boxes I wanted to cut in half to make 5 frame nucs boxes. Didn't think about measuring anything. just tossed them on the table saw and cut them in half. Guess what, they are about an inch narrower than the commercial 5 frame nucs and only hold 4 frames unless I really push the fifth frame in. LOL measure twice, cut once. Still usable but a bit of an unexpected downsize. They just barely fit on a commercial 5 frame nuc .