Features Enhanced Durability and Comfort: Experience exceptional performance with high-temperature quenching heat treatment that strengthens hardness and ensures comfortable usage Premium Alloy Steel Construction: Crafted from high-quality alloy steel, these bits resist wear and tear, significantly increasing their service life for long-lasting reliability Strong Magnetic Adsorption: Features an overall strong magnetic treatment that securely holds screws in place, allowing for quick and effortless installation User-Friendly Design: Designed for ease of use, these bits boast exquisite workmanship and are compatible with electric screwdrivers, making them perfect for any project Impact-Resistant Performance: With a 4mm inner hex design, these bits offer high hardness and excellent toughness, ensuring they withstand heavy-duty tasks with ease Features: 1、High temperature quenching heat treatment strengthens the overall hardn, more comfortable to use. 2、Made of alloy steel material, which makes it resists and increases service life. 3、Overall strong magnetic treatment, with strong magnetic adsorption screws, simple and fast . 4、Easy to install and use, with exquisite workmanship, suitable for electric screwdrivers. 5、4mm/0.16in inner hex screwdriver bits, , high hardn, impact resistance, good toughn. Specification: Item Type: Screwdriver Bit Material: Alloy Steel Color: As Picture Shown Shank Diameter: Approx. 6.35mm/0.25in Length: Approx. 100mm/3.94in Weight: Approx. 200.0g/7.05oz Package List: 10 x Screwdriver Bit Note: betweendiv>1. Please allow 0？1 inch error due to manual measurement. Thanks for your understanding.between/div>betweendiv>2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.between/div> Package List 10 x Screwdriver Bit