Home Products Threading Tools Screw Extractors Screw Extractor Square Flute #4 Screw Extractor Square Flute #4 (73204) Easily removes 1/2-Inch to 9/16-Inch broken bolts and screws Use 5/16-Inch left handed drill bit to drill hole this will help loosed bit Ideal for thin wall extractions Find a Retailer Find on Amazon