Using high-carbon steel, wear-resistant, wear-resistant, and long service life 3 / 8 " Extension Drill Bits Bit Set Power Tools 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 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 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, Manufacturer: KACCDE