It is 13.5" wide, and 16" deep so almost the same as a regular toolbox. Hard to see in the pics I posted, but it does have the rounded-over "lip" to hang on the side of the box. Top looks just like you would expect if a roller, just smaller.
No dividers like I would expect from a parts bin. Think it is similar to a Snap-On locker regarding "styling" (don't think it is actually SO).
Edit: The silver marks on the inside of the door are just where paint wore away, no hooks or anything on the inside. Thing is probably at least 60-70#, probably more (empty).