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