High-speed steel bits. Set has both titanium-coated bits for steel, woods and plastic and tungsten carbide-tipped masonry bits for stone, concrete and block. Includes HSS Titanium 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5 and 7mm and TCT Masonry 4, 5, 6, 7, 8 and 9mm.1 – 9mm