This part adds spaces for some drill bits (4, 5, 6, 8, 10 mm) and countersink bits (5, 2x6, 2x8mm shaft), as well as three trays for a Wera bit set, a box of smaller drill bits and some miscellaneous items.

It is made to fit a Hawera HSS drill box.

Since this is hardly a very universally compatible part, I have uploaded STEP as well as SOLIDWORKS (Onshape export, not native) files. 

The model was created in Onshape, so here is a link to the document: https://cad.onshape.com/documents/5eac084abdaedc50d290fc0e/v/61f7e7ff8dbc02025d59fc01/e/22522264fa5b97fadf168345?renderMode=0&uiState=674cebecd5620e3fd50304c8

If you need a file format I have not uploaded but is supported for export by Onshape, you can export this yourself by right-clicking the part or Part Studio in the Onshape document.