Radio Shack Wire Spool Holder

This is a spool holder for four small wire spools from Radio Shack, of 55.4mm (2.18") diameter, 20.6mm (0.81") height, like these:
http://www.radioshack.com/product/index.jsp?productId=2049745
I included slots in the thin piece so you can hook the wire through to keep it under control.