General description This set of 7 Power Grip Screw Extractors is designed to remove rusted, damaged, or painted-over screws easily. They are suitable for use with power drills and nut drivers, making screw removal quick and efficient. Technical specifications Number of pieces: 7 Sizes: 3/16 inch, 1/4 inch, 8mm (5/16 inch), 3/8 inch, 10mm, 11mm (7/16 inch), 1/2 inch Drive size: 1/4 inch Material: High carbon steel for durability Compatibility and accessories Compatible with power drills and nut drivers Universal shape fits metric and fractional screw sizes Installation Insert the appropriate extractor into a compatible drill or nut driver Align the extractor with the screw to be removed Use the drill to turn counterclockwise to grip and remove the screw Usage Designed for removing rusted, damaged, or painted-over screws Reverse spiral flutes provide maximum gripping power Suitable for awkward, burred, or headed screws