Weha High Speed Diamond Core bits for granite, marble, quartzite, quarts, engineered stone, concrete counter tops, and all natural stone.
Product#  20136  1"
                20137  1 1/4"
                20138  1 3/8"
                20139  1 1/2"
                20140  1 3/4"
                20141   2"
With diamonds both inside and outside the barrel to reduce drag, heat, and friction, along with high diamond content segments, the Weha dry diamond core bits will drill holes in 3cm granite in less than 30 seconds.

The Weha High Speed Diamond Core Bits are built to be the best dry diamond core bit for granite and engineered stone counter top faucet hole drilling.
But they can also be used wet with Air Polishers in shop applications.