This extension rod features a precise 6.3mm inner hexagonal apertures and hexagonal shank diameter, designed to meet extension requirements for various tasks Featuring an ergonomic large spherical grip with antislip design, this extension rod allows for a handed operation—simply press to release the popping up bit for high work in demanding environments The large head popping up quick releases auto locking extension rod enables effortless and secure installation or removal of drill bits without loosening, significantly boosting work efficiency Ideal for handcraft enthusiasts, professional mechanics, and contractors who frequently use electric drills or screwdrivers and need safe, quick tool accessory changes for enhanced productivity Perfect for automotive repair, construction projects, and home improvement scenarios where a secure and efficient extension rod is essential for accessing tight spaces or extending tool reach, Manufacturer: LIbgiubhy