【S2 Alloy Steel Construction】Made from S2 alloy steel with a hardness of HRC60, these hex shank drill bits are heat-treated for exceptional durability and wear resistance 【Magnetic Tip for Efficiency】The magnetic tip securely holds nuts and bolts, improving work efficiency and versatility across a wide range of applications 【Extended Length for Versatility】At 100mm (3.94 inches), these professional drill bits are longer than average, allowing for more effective use in a broader range of scenarios 【Green Heat Shrink Design】The green heat shrink tubing not only enhances aesthetics but also adds a unique touch to the product 【Ergonomic Round Handle】A custom round handle design increases flexibility and torque concentration, providing a superior craftsmanship and user experience 【Comprehensive Size Range】Includes 10 metric sizes from 1.5mm to 12mm, suitable for a variety of precision hexagonal wrench applications Specification: Material: S2 alloy steel Quantity: 10 pieces Head Type: Hexagonal Shank Type: 6.35mm 1/4 inch Length: 100mm (3.94 inches) Hardness: HRC60 Sizes: 1.5/2/2.5/3/4/5/6/8/10/12mm Equivalent Imperial Sizes: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16 inch