1" Core Bits for Granite, Marble, Concrete, Concrete Tile, and Stone Countertops Designed for drilling granite, marble, concrete, and other hard masonry. Great for faucet mounting holes in stone and concrete countertops Can be used dry when water is not an option, but drilling with water will extend the segment life. 2" Drill Depth, 8 mm segments 5/8"-11 Threaded 1 inch