Impossible Die Escape

This one looks really impossible!

The routine is simple!
Push a small magic wand through a hole in a square tube.
The wand now blocks the hole.
It is impossible for most objects to pass through the tube.
Or is it??

You drop a die into the tube- and it passes through the wand and out the other end of the tube!

This is a very clever piece of magic equipment!
Shows up well for a small group or classroom too!