Review on Aopin Diamond Ceramics Porcelain Marble Cutting Tools and Hole Saws & Accessories by Eric Chapman

Firstly, have you noticed that there is no middle wire? *trying* to keep that thing on target. After I managed to drill the first hole, all the 'diamonds' fell off and I just had to drill through the bare metal, which was actually pretty neat because as I was drilling it started turning red. Look, just spend a few bucks more for one with lead and one with dare I say real diamond dust that won't flake after use? Yes. Do that. A few bucks don't matter. And the frustration you save will be worth it.