Features and Benefits: Removes Screws 5/8-7/8;Use Left Hand Drill Size: 3/8;Forged Hi-Carbon Steel;Square Style;Made In USA;KnKut Square Style Screw Extractors have the ability to remove broken bolts and screws with little deformation of the broken part. Square Style Extractors will not chew up or expand the object being removed. Left hand drill bits are recommended to drill a hole in the broken part. Insert extractor and turn counterclockwise.