Titanium-coated high speed steel. For steel, alloys, natural and artificial wood and plastic. Supplied in convenient storage case. Includes 2 x 1mm and 1 x 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8 and 9mm.