Product Description A specialized type of core drill bit designed for drilling holes in materials without the need for water or other coolants. These bits are typically equipped with carbide or diamond-tipped cutting edges that are designed to withstand the heat generated during drilling. From the Manufacturer Diamond products 04751 4 1/2-Inch heavy duty Orange dry hole saw bits offers good life in block and soft brick while maintaining segment integrity in dry applications. These hole saw bits are not for use on concrete and has 9-Inch of drilling depth. There is a Jacobs chuck adapter available for hand held rotary drills 5/8-Inch to 11 thread to straight shank.