Quick Release Mechanism : The quick release mechanism allows for easy and fast switching between drill bits, making it more efficient to use. Self-Locking Feature : The self-locking feature ensures that the extension rod stays securely in place, preventing any slippage or accidental disconnection. Hexagonal Shape : The hexagonal shape of the extension rod provides a better grip and allows for greater versatility in terms of the types of screws it can be used on. Electric Drill Driver Compatibility : This extension rod is compatible with electric drill drivers, making it a convenient and powerful tool for a variety of DIY projects. Length: 60mm, 100mm, 150mm. Hand electric drill electric screwdriver labor-saving accessory, made of CR-V (chrome vanadium steel) The diagonal diameter of the hexagonal shank is 1/4 inch, i.e. 6.35mm, and the hexagonal socket has strong magnetism. Features: The interface has a locking mechanism and is equipped with strong magnetic field. Suitable for the transfer of electric drills, elevators, wind drills, etc., extending the conversion and use of various screwdriver heads and screwdriver heads; Fast and secure; Greatly improve work efficiency. Special reminder: This extension rod can only be installed with a single head nozzle, and cannot be installed with a double head nozzle!!! It can be used for the transfer and quick replacement of imported and domestic 1/4 electric screwdriver, manual electric screwdriver, electric drill electric screwdriver, and other tools.