Do not buy these for drilling holes in glass. There's very little abrasive on the tip, and what's there comes off instantly, leaving hardly a scratch on the glass. I use them underwater with light pressure on a drill press. Having drilled holes in glass off and on for decades, I know the tool does the job. These bits are good for widening an existing hole, the abrasive on the sides seems well attached. For holes in glass I prefer a core drill. You get what you pay for with these tools, they are inexpensive and don't last long.
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