3 / 8 " Extension Drill Bits Bit Set Power Tools of Application: It can be used for installation on tools with shapes such as pneumatic screwdrivers, electric screwdrivers, air drills, electric drills, and manual screwdrivers Using high-carbon steel, wear-resistant, wear-resistant, and long service life Unique Design: the anti-dropping steel ball is better fixed: the self-locking device is not easy to slip or fall off and cause situations design, greater bearing capacity Usage: suitable for screwdriver handle or electric screwdriver tool ( three-jaw chuck) 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: ljhnba