Length: 60mm, 100mm, 150mm. Hand drill electric screwdriver labor-saving accessory Suitable for connecting electric drills, screwdrivers, wind drills, etc., extending the conversion and use of various types of screwdriver heads; Fast and tight The diagonal diameter of the hexagonal handle is 1/4 inch, which is 6.35mm. Features: The interface has a locking mechanism. Solid; Greatly improve work efficiency., Weight: 0.49383546688 pounds, Manufacturer: Kueohse