Hitachi 728028 3/8-Inch Diamond Core Bit Review

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.

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Product Description:
Hitachi's revolutionary line of diamond grit drill bits are ideal for the professional and/or serious DIYer who drills into hard materials like tile, marble, porcelain, granite, slate and glass. They significantly outperform the standard carbide glass and tile bits on the market today, both in speed of drilling and the number of holes that can be drilled per bit. These diamond grit drill bits are easy to use, only water is needed and they can be used with any cordless drill for flexibility and convenience.

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