Features Enhanced Durability And Strength: Crafted from S2 alloy steel and treated with high-temperature quenching, these bits ensure long-lasting performance for all your hardware tools needs Strong Magnetic Attraction: Featuring a robust magnetic treatment, these bits securely hold screws in place for improved precision and efficiency during use Quick And Easy Operation: Designed for effortless handling, the magnetic screwdriver bits allow for swift and hassle-free work, making them perfect for both professionals and DIY enthusiasts Versatile 10-Piece Set: With 10 different electric screwdriver bits included, you have a complete set to tackle various tasks, meeting all your replacement and project requirements Precision 4mm Size: The 4mm screwdriver bit is ideal for a wide range of applications, ensuring compatibility with most electric screwdrivers for versatile use in any project Features: 1、This screwdriver bits use high temperature quenching heat treatment to strengthen the overall hardn and comfortable to use. 2、The 4mm screwdriver bit is made of S2 alloy steel, which resists and increases service life. 3、This overall adopts strong magnetic treatment, with strong magnets can attract screws. 4、These magnetic cross electric screwdriver bits are easy to operate and quick to work. 5、There are a total of 10 electric screwdriver bits, which can meet your replacement needs. Specification: Item Type: Cross Screwdriver Bit Set Material: S2 Alloy Steel Shank Diameter: Approx. 6.35mm / 0.3in Length: Approx. 50mm / 2in Specification: Approx. 4mm / 0.2in Package List: 10 x Screwdriver Bit Package List 10 x Screwdriver Bit