Quick and easy to remove most kinds of damaged, stripped, rusted, broken, or stuck screws, bolts, studs and pipes Made of high carbon steel with high hardness, strong and , Convenient and efficient, long service life Fits wood and machine screws, flat, hex or painted over screws, Can be used with the drill 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: Ounfhtrttk