Review on Diamond Drill Masonry Drilling Tools: Unparalleled Precision and Performance by Tropingzz Cece

I'm so happy with how well it worked! We used it to cut 3 holes in 3 mirrors. The back of the mirror had a few small chips in the silver (we sealed the back to minimize this), but otherwise they're pretty damn perfect. There are no cracks at all (drilled very slowly). Smaller chips will be obscured by anything we put through the holes on the mirrors, so it doesn't matter anyway. We made a small mud ditch to hold the water we poured in while drilling the holes and it worked fine. The bit is still near perfect and looks like it could easily cut through many more mirrors. If we were to take them to a glass shop to have them cut, it would cost much, much more than the price of this piece. Amazing value. Highly Recommended!