BlueSpot Tools HSS Drill Bit Set, manufactured from high-speed steel for increased durability. A ground flute gives increased accuracy when drilling. Suitable for drilling in iron, non-ferrous metals, plastic, steel and wood. Supplied in a robust metal case. This 25 piece set contains the following Sizes 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5 and 13mm