Most toolbox manufacturers quote a size of 20", but that is only the top bit and you then find that the bottom bit is actually only about 15" long inside. This Fatmax toolbox is 20" at the top and also 20" at the bottom: I can fit in a circular saw, a jigsaw and an extension cable reel, plus other assorted saw blades. I was tempted to get the 26" box, but it wouldn't fit on the shelf where I was going to put it and the 20" is fine for what I needed it for. It's very sturdy and fastens well.The box is well made and up to the job, the catches are a bit stiff, but it's Bob on, and stores my circular saw as it's deeper than some. It's up to some stick, well happy 10 out of 10. Thankyou.It's a great toolbox, which also acts as a sturdy step. Not 5 stars because the tray drops into the bottom far too easily, and the catches are heavy and cumbersome.Very good quality toolbox. Very sturdy and holds a lot of tools.Good tool box, but bottom black plastic split after 6 months. Have replaced with the parat classic tool case.