Description Features: Extractor set can be used to remove broken studs, bolts; The internal thread with reverse spiral flutes design to bite down to provide maximum gripping power; Made of heat-treated high-quality high-carbon steelis tool,provides superior wear and corrosion resistance. Suitable for homeowners, carpenters, mechanics, artists, and amateurs; Easy operation; Specifications: Material:High-carbon Steel Color:Black Includes:1/4,7/32,3/16,5/32,1/8,13/32,3/8,11/32,5/16,9/32 Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 10xScrew Extractor