High Quality: Hard steel holder extension bar 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: 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 Note: The data are all measured manually, please allow some error 1-3cm Due to differences in light and display, there may be some color differences, please refer to the actual item received.