Concrete Diamond Core Bits are available in Premium and Supreme qualities for drilling of concrete, field stone and other materials. Diamond Core Bits are available in Premium quality and are used for drilling of tile, marble, granite and other stones and concrete. These diamond core bits are designed with premium diamond for superior coring performance and long life and are typically used wet on hand drills and core drilling machine, but dry core bits are available. Core Bits are specifically designed to tackle a variety of soft brick and concrete block drilling operations. They feature laser-welded technology and inventive bar-slot cooling to promote efficiency, reliability and safety.