1/4" Inch 6.5 mm DiamondSure Diamond Drill Bit Hole Saw for Glass, Tile, Granite, Ceramic, Porcelain, Stone
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<b>[Product Information]</b><br>
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<li>they are electroplated, blonded and designed for drilling to depths of about 1/2" in ceramic tile</li>
<li>Not designed for use on concrete, masonry, metal or for use with impact hammer drills.</li>
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