The product description states "This size can fit items up to 24x36 in size and 2.1870 deep (with the glass installed). "If you actually take a ruler to the foam box it only measure out to 1.75" thick. So even with the 1/8" plexiglass on top of that, you're still gonna be short about 5/16" of an inch.Beautiful shadow box that fits our contents perfectly. Took three months to arrive.Lots of little things included like Velcro etc but as far as I can see nothing to help actually mount it on the wall. A nicely made itemThis box comes with a lot of extra stuff like double sided tape and velcro in addition to things to hang the box with on the wall. The glass doesn't smudge as easily as other things I've bought in the past. The wood doesn't seem extra high quality, but I'm not an expert on that, and it still looks sleek on my wall. I used it for a poster and drum stick I got from a concert.Was a little apprehensive about ordering after reading some of the reviews, but was happy with the frame. Many parts and pieces included with no directions, but didn't use them anyway. I was floating a watercolor so didn't use all the extras. I will order again.I am really impressed with the quality of this. The frame is really nice and substantial. The only reason I didn't give it five stars is because the hangers weren't attached (but were included), which was a little difficult for me to do. Overall I am very happy with this.Fit inside as stated. We used this to protect a 1 inch deep wood plaque, not to actually use as a shadowbox. Put some foam (repurposed foam it came with that protected it in shipping) in back to bring plaque closer to glass. Love how it came out.The double sided tape that cam with this is useless as what I mounted on Saturday night already felll offGreat quality. Arrived on schedule. Bought it to frame a pin towel my son got in Cooperstown at a baseball tournament, turned out phenomenal.