Product review (5 stars): Buy these today.
Everything about this product is right.  It addresses a common problem with a simple, solid design and it isn't expensive.  I was about to attempt drilling into my granite but I was too worried I'd crack it.  My only regret is that I didn't think to look for an alternate solution sooner.  Very happy with this product.  Kraydad's included supplemental instructions that I found very helpful.  Buy them now.