The Alpen 50pc HSS Sprint Master Drill Set features a comprehensive selection of high-speed steel drills, designed for superior toughness and precision. Ideal for drilling alloyed carbon and plain steel, this set ensures excellent cutting efficiency and durability. Sizes : Includes drills in sizes: 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9mm Brand : Alpen Special Features : Toughness and precision combined with excellent cutting efficiency for drilling alloyed carbon and plain steel Ideal for hand-held operations Special point shape for enhanced speed Long life due to high-quality HSS steel Break-resistant with high elasticity and toughness