Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: what is the interior measurement?
Document: If you are looking for something taller than (almost all of) the other risers in the marketplace, this IS NOT it. Description states this is 7.6&#34; high. The actual measurement is 5.25&#34; high, plus it also has a 1 1/8&#34; thick brace attached to the underside of the top. The thickness of the brace taking away even more of the space underneath means that a piece of equipment (dvd, blu-ray, in our case a cash register drawer) cannot be any taller than 3 1/2&#34; high.
this looks great and matches almost any black / dark brown furniture. I use it in my bedroom, not for a monitor, but to help stack my cable box and ps4. I keep my at&t uverse box underneath, and my ps4 on top. Lots of room for extras. Very classy looking too... compared to the other ones being sold that look like cheap plastic, this looks like it belongs in the bedroom / living room / family room and not in an office.
Works great. It raised my TV higher and I placed the cable box inside and everything works great. Now the TV does not sit on the cable box
We put our new 50 inch Samsung TV on it and it worked exactly as we wanted. We did decide, however, that our TV needed to be raised higher so we bought the Foremost Modular Large Open Cube Storage System to use instead. We moved this riser to under our bedroom TV and it works perfectly there too. I highly recommend this to anyone who wants to raise either a monitor or a TV. It handled our 50 inch TV with absolutely no problems
This works fine for our needs, but its not as big as they say. Only provides about 3-3/4 in. clearance vertically. Horizontal clearance is about 22-1/4 inches.
This riser is great! works like a charm and I will make sure to purchase again if I need another!
This is perfect! It is the proper high to fit my cable box and Apple TV, with room to spare.
The step was perfect for my needs. It fit right of top of my TV cabinet. The TV sits on top of that and the cable box is placed in the riser out of the way. Very pleased with the way it works.Paul in Texas
Purchased to be used to raise computer above carpet. Seems adequate and sturdy enough for this usage -- and was easily assembled in under 15 minutes. Not a piece of furniture I expect to impress others -- but not so cheap that I'm ashamed to have it in my home.
It was just what I needed to lift my new TV up to eye level. You always seem to have everything.
Answer: Roughly 22 inches from inside edge to inside edge.