The first one I used went dull in about 20 seconds. It barely left a mark on the glass I was working with. The next one I used was on soft metal. Very unimpressive. You get what you pay for. Buy Ryobi drills if you want to grind through glass.Get more detail about Pro-Quality 20-Piece Diamond-Point Bit Set for Rotary Tool - Glass, Stone, Ceramic.
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