Dryrod? - Anyone used them?

I have no knowledge or experience of this at all so perhaps Im missing the point completely here but how does inserting one of those rods into a hole drilled into concrete make a water barrier? How can it possibly penetrate through the concrete?

Edit - just to clarify the above, I know you use multiple rods and not just one.
 
I have no knowledge or experience of this at all so perhaps Im missing the point completely here but how does inserting one of those rods into a hole drilled into concrete make a water barrier? How can it possibly penetrate through the concrete?

Edit - just to clarify the above, I know you use multiple rods and not just one.

From my brief look it appears as though the rods break down and penetrate into the surrounding brick work.
 
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