1、This set is designed to remove damaged, rusted or stripped screws on hardwood. 2、HSS extractors have left handed flute designed for extra gripping power. 3、There are total 3 extractors in various sizes for different screws. 4、They are all well packed in a plastic box for convenient carry and storage. 5、These extractors work with a electric power tool with a chuck or a connector to remove screws. Features: This set is designed to remove damaged, rusted or stripped screws on hardwood. HSS extractors have left handed flute designed for extra gripping power. There are total 3 extractors in various sizes for different screws. They are all well packed in a plastic box for convenient carry and storage. These extractors work with a electric power tool with a chuck or a connector to remove screws. Specification: Material: High speed steel Surface finishing: Titanium coating Type: #1, #2, #3 Package list: 3 * Extractors 1 * Box