Length: 60mm, 100mm, 150mm. Hand drill electric screwdriver labor-saving accessory The diagonal diameter of the hexagonal handle is 1/4 inch, which is 6.35mm. Features: The interface has a locking mechanism. Suitable suitable for connecting electric drills, screwdrivers, wind drills, etc., extending the conversion and use of types of screwdriver heads; Fast and tight Solid; Greatly improve work efficiency. Special reminder: This extension rod can only be used suitable for single headed nozzles, and cannot be used suitable for double headed nozzles!!! Can be used suitable for the transfer and quick replacement of and domestic 1/4 electric screwdrivers, manual electric screwdrivers, electric drills, electric screwdrivers, and other tools. Colour:black Material:Metal Package Contents: 2 set * black quick release connecting rod Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.