Quick and easy to remove most kinds of damaged, stripped, rusted, broken, or stuck screws, bolts, studs and pipes Fits wood and machine screws, flat, hex or painted over screws, Can be used with the drill Made of high carbon steel with high hardness, strong and , Convenient and efficient, long service life Screw extractor size includes #1 for 1/8inch-5/32inch , #2 for 5/32inch-3/16inch, #3 for 3/16inch-1/4inch, #4 for 1/4inch-5/16inch, #5 for 5/16inch-7/16inch, #6 for 7/16inch-9/16inch, 7# for9/16inch-3/4inch, 8# for 3/4inch-1inch, Manufacturer: PokFhgur