BlueSpot Tools HSS Drill Bit Set, 25 PieceBlueSpot 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