Box for 4V-40V DC-DC Step Down LM2596

I bough the step down on eBay for my Arduino projects:
http://www.ebay.com/itm/400506673113?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
You will need four M3x10mm screews.