Material: Made of high carbon steel, durable, surface oxidation is not easy to rust, the service life is longer. Strong Magnetism: These screwdriver bit adapters have powerful magnets embedded in their heads that securely hold the drill bit, minimizing dislodgement and wobble, allowing for precise and efficient drilling. Easy to Use: Slide the sleeve forward to rotate the head, backward to straighten the holder. To make the head stable, you need to hold the sleeve when drilling. Two Different Lengths: There are two different lengths of this product, 92 mm and 144 mm. The flexible drill bit holders can rotate 20 degrees for angled drilling in tight spaces and corners that will meet your needs in different conditions. Wide Range Application: Suitable for common 1/4" hex screw bits and can be used with electric screwdrivers, hand screwdrivers, electric drills and air drills.