The Vevor 4" wet/dry diamond core drill bit is built for drilling through tough materials such as concrete, red brick, and foam brick. It features a 5/8"-11 inner thread for compatibility with handheld drills and standard core drilling equipment. The laser-welded construction and diamond-grit head are designed for stable cutting performance and long service life. This kit also includes a pilot bit for improved drilling alignment and an 80 mm diamond saw blade for added versatility.