【High Quality】: Hard steel holder for maximum durability, sturdy construction allows for a long service life 【High Quality】: Hard steel holder for maximum durability, sturdy construction allows for a long service life 【Quick Use】: The bit holder has strong magnetism for quick connection or disconnection and ensures it stays in place while driving 【Universal Fit】: Universal 1/4" hex shank and 1/4" hex socket fit most power drivers, handheld drivers and bits 【Easy to Carry】: The small size allows you to bring your bit extension bar anywhere to do any job and can fit in many tool bags 【Application】: Very useful for removing or tightening a large number of screws after starting or loosening them. There are three extension holders of different lengths and you can use the suitable one for various needs. Description: These extension holders are made of high-quality carbon steel and chrome-vanadium steel with a sturdy construction to ensure maximum durability. It can be used for a variety of