General description Set of 7 Power Grip Screw Extractors designed with reverse spiral flutes for maximum gripping power. This universal set fits both metric and fractional sizes, making it versatile for various applications. The extractors are suitable for use with power drills and nut drivers, allowing for easy extraction of rounded off, rusted, tight, and painted over bolts. Technical specifications Sizes: 3/16in, 1/4in, 5/16in, 8mm, 3/8in, 10mm, 11mm, 7/16in, 1/2in Drive Size: 1/4in Material: High carbon steel Other information Supplied in a durable plastic case