3PCS 60MM/100MM/150MM DRILL BIT HOLDER EXTENSION BAR FOR 1/4" HEX SHANK ELECTRIC SCREWDRIVER BITS This Bit holders have strong magnetoconductivity for quick connect or disconnect, provides convenient pick-up and retention of screws and ensuring stay in place while driving The Extension Bar consist of universal 1/4 inch quick hex shank and 1/4 inch hex socket, fits all impact driver, drill chucks, most electric screwdrivers and bits These expansion bar are small size and can be carried around with you, help you complete any work. They can be put in many tool bags, it is also very convenient to use outside Three-piece design is engineered for maximum versatility, three extension holders in different lengths include 60mm/100mm/150mm, and you can use the proper one for various needs