1/8", natural stone, tile bit, multi-grind head, designed with multiple cutting edges for harder tile materials, fast drilling in hard materials, delivers 20 percent faster drilling than glass & tile bit, specialized carbide tip centers for no skate drilling & greater ease of use, high quality carbide material, provides longer life in hard materials, specially designed for natural stone tiles, specific use for these specialty tiles, engineered for use in natural stone tile, slate, granite & other specialty tile materials specialty tiles that may be harder than normal tile, not recommended for use on porcelain tiles, compatible with hammer drills.