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Alfa Tools Thin Wall Marble / Granite Core Bits are for precision drilling of holes in tile, marble, granite, stone, concrete block and sanitary brick. The continuous rim design makes the holes smooth and clean. These bits fit conveniently in almost any standard electric drill chuck.
Thin Wall Diamond Core bit
Continuous Rim Design
1-inch Diameter, 3/8-inch Shank
2-inch Drilling Depth
4-inch Overall Length