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 Craft of metal, stable, firm and durability Hexagonal connecting rod converters drill chucks, M14 polishing disc connecting rod power tool accessories Light weight Size: Small size, easy to store and carry, bring you convenience 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, Manufacturer: yanzunlrn