Hitachi 728020 3/16-Inch Diamond Core Bit Review

If you use this drill bit as its supposed to be used it works quite well.I used a water bath (constant water is essential) and drilled several holes in agate with no problems. Don't force the bit; take your time

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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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