This is a mechanical dimensions template Eagle layout file, fitting into Takachi TWF4-2-5 encosure box. You even find the mechanical drawings in the Eagle file if enable all layers, you will see.

http://uk.farnell.com/takachi/twf4-2-5w/multipurpose-flanged-enclosure/dp/2478724

http://www.takachi-enclosure.com/data/p_01plastic.html