Simpson CBMX20022 SDS-MAX Core Bit 2" X 22"Simpson Strong Tie Core Bits are made to the same exacting standards as our standard carbide tipped drill bits. They utilize a centering bit to facilitate accurate drilling in combination hammer drill mode. These core bits are effective when cutting cylinders out of stone or concrete and can be paired with diamond core drills. They are guided by the centering bit that allows for easy to use drilling. California Residents: WARNING