【S2 Alloy Steel Construction】Made from S2 alloy steel with a hardness of up to HRC60, these hex shank drill bits are heat-treated for exceptional durability and wear resistance 【Magnetic Tip Design】The magnetic tip securely holds nuts and bolts, improving work efficiency and expanding the range of applications 【Extended Length】Professional drill bit length of 100mm (3.94 inches), longer than average market offerings, providing enhanced effectiveness across a wider range of applications 【Green Heat Shrink Tubing】Aesthetic and practical green heat shrink tubing design adds uniqueness to the product while improving grip and identification 【Ergonomic Round Handle】Custom round handle design increases flexibility and torque concentration, offering improved craftsmanship and user experience 【Versatile Metric Sizes】Set includes 10 pieces drawdriver bits with metric sizes ranging from 1.5mm to 12mm, suitable for a variety of precision hexagonal wrench applications 【1/4 Inch Hex Shank】Compatible with standard 1/4 inch hex drive tools for versatile use across different power tools and manual drivers Specification: Material: S2 alloy steel Hardness: Up to HRC60 Bit Length: 100mm (3.94 inches) Shank Type: 6.35mm 1/4 inch hex Metric Sizes: 1.5/2/2.5/3/4/5/6/8/10/12mm Imperial Sizes: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16 inch Surface Treatment: Black phosphate coating for rust prevention