I use these bits regularly to drill glass ranging from 1/8 to 3/4 inches and averaging 3/8ths inch thick. I can drill more than 250 holes with a single bit when run in a cold water bath on a drill press. They rarely clog, are self cleaning, create an accurate hole and start well on irregular surfaces. They are manufactured from heavy duty materials. They are stout. I have tried about five other brands of various designs. This Hitachi design is simply the best.Get more detail about Hitachi 728028 3/8-Inch Diamond Core Bit.
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