1" Diamond Core Bit for granite, marble and concrete. Free drilling instruction guide. You can drill holes in poured concrete, concrete block, granite counter tops, floor tiles and porcelain. 3/8" shank (or shaft) will fit in almost any drill or drill press with a 3/8" chuck or larger. Free shipping in the US. 1" is also the most popular size for placing anchors in concrete, brick and block. 100% money back guarantee. No hassles, no hard feelings.
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