The US PRO 6-60mm HSS-G Spiral Step Drill is crafted for precision and durability, ideal for drilling a range of hole sizes in various materials. This step drill features a high-quality HSS-G construction and a heat-treated design for enhanced performance. Steps : 6, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, and 60mm Material : Quality HSS-G, heat treated for increased hardness Shank Diameter : 13mm Shank Length : 25mm