[2 Sizes Magnetic Bit Holder]A 30cm extension bar and a 15cm extension bar with 2 practical screwdriver bits in the set, the two lengths can be flexibly exchanged to help you easily deal with all kinds of hard-to-reach working areas and narrow corners, which greatly improves the convenience of work. [Precise Compatibility with Standard 1/4" Diameter]The carefully designed standard hex bit mounting hole with a diameter of 1/4" fits perfectly with most screwdrivers and drills, allowing you to quickly and accurately complete your screwdriving work. Please make sure the diameter of the batch head matches before purchasing. bit holder extension [Heavy-duty steel and aluminum material]This magnetic bit holder extension is made of high-strength steel and high-quality aluminum alloy, which has excellent wear resistance and corrosion resistance, high hardness and long service life. Whether it is construction or high-intensity maintenance work, it has outstanding stability and durability. [Wide range of applications]This magnetic bit holder is suitable for a wide range of scenarios, including but not limited to narrow space maintenance, plant construction, decorative panel processing, wood frame assembly and other complex environments. No longer limit your work, become your ideal assistant to solve problems and improve efficiency.