High Quality Material: Made of high quality TS2 alloy steel with impact resistance. The hardness reaches 63HRC, which can be used in high-strength working situations. Design: The anti-slip and anti-rust function ensures that the screwdriver bit locks the screw precisely, while extending the service life. Magnetic: The screwdriver bits are magnetic, which can firmly lock the screws, prevent the screws from falling off easily, and improve work efficiency. Wide Compatibility: The 1/4 inch hex shank is compatible with a wide range of equipment, including impact drills, pneumatic drills, electric screwdrivers, manual screwdrivers, and cordless drills. Packages: Includes 20 pieces of magnetic anti-slip drill bit. The size is 25 mm.