The Cordless Multi drill bit set is IRWIN'S most versatile drill bits. Designed to drill in multiple materials including brick light concrete dry wall ceramic tiles sheet metal wood plastic and marble. In addition to the multipurpose function the cordless multi drill bits are IRWIN'S s problem solver for drilling into ceramic tiles up to a hardness grade of 9. Ideal applications – Perfect for being used to drill multiple materials in a variety of applications including installation of shelves curtain rails or outside lights and garden decoration.