4mm Magnetic Screwdriver Bits, 10-Piece Set

【Enhanced Hardness】Thermal hardening hardens the alloy steel, providing impact resistance and high toughness to prevent loosening under torque.
【Powerful Magnetism】The integral magnetic treatment securely holds 4mm screws, allowing for one-handed use in tight spaces without dropping fasteners.
【Standard Hex Shank】The 0.16-inch (1/4-inch) hex base fits common power screwdrivers and quick-change chucks, no adapter required.
【Corrosion-Resistant Construction】The alloy steel with rust-resistant properties repels moisture and dirt from the workshop, preserving the tip's precision over time.
【Quick Installation】The bits snap directly into the tool chuck, allowing for quick changes between 10 identical pieces to maintain uninterrupted workflow.