10Pc Magnetic Extension Socket Drill Bit Holder 1/4" Hex Screwdriver Nut DriverUniversal 1 4 inch hex shanks fit a variety of quick change chucks and hexagon tools ( pneumatic screwdrivers, electric screwdrivers, pneumatic drill, drill, pistol drills, screwdrivers ). Magnetic extension socket drill bit can be used with a hex socket , impact or bit driver, make it easier to install,loose or remove. This magnetic bit holder is super magnetic, with good adsorption, grab bits and fasteners securelynot easy to fall off during the