A simple alignment tool.  I used it to align my magnetic toolbox labels, but I expect there are many other uses.  The tool aligns on the left side, right side, or middle.  I included magnet pockets on the bottom for storage.  Even though the magnets press fit, a drop of superglue is probably needed to keep the magnets from pulling out.

The following are all configurable:

• Offset from the sides (left and right offset are identical)
• Offset from the bottom
• Magnet size (so you can use whatever round magnets you have around)

I store mine on the bottom side of a drawer, so it takes zero space: