This is a bin divider for a set of small parts drawers. Not particularly difficult to draw up, but it might save you a few minutes modeling it. This one is pretty snug and snaps into place nicely.

Note that there are a number of different sizes for these drawers that all look pretty similar. See the dimensioned drawing I provided to make sure it is the correct size for your application. Unfortunately I'm not even sure which manufacturer made the ones I have.