10 Piece HSS Sprint Master Drill Set Sizes : 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10mm  HSS Twist Drills : Toughness and precision combined with excellent cutting efficiency for drilling alloyed carbon and plain steel. Ideal for hand held operations.  Break resistant with high elasticity and toughness Special point shape for speed Long life due to high quality HSS Steel