Usage: suitable for screwdriver handle or electric screwdriver tool (three-jaw chucks) to drive the sleeve. After installation, the joint can be converted into a square for head, which can be used for the installation of the sleeve. A powerful tool for conversion . Hexagonal connecting rod converters drill chucks,M14 polishing disc connecting rod power tool accessories. Craft of metal , stable, firm and durability. Light weight Size:Small size, easy to store and carry, bring you convenience. Scope of Application: It can be used for installation on tool with shapes such as pneumatics screwdriver, electric screwdriver, air drills, electric drills, and manual screwdriver.