It is a refined version based on "CNC drill toolbox" http://www.thingiverse.com/thing:83859
You can find 6 things - 3 toolbox for tools numbered as 01-20 / 21-40 / 41-60
the best tuned version is a toolbox for 01-20 - thiner box, lighter thing
top thing is sticked with bottom (not hard fix but fine for the most use)