Screw Extractor Set, Extractor Type Reverse Spiral Flute Bolt Extractor Power Bit, Number of Pieces 7, For Bolt Size 1/2 in, 1/4 in, 3/16, 3/8 in, 5/16 in, 7/16 in, Material - Machining Carbon Steel, Container Type Case, Drive Size 1/4 in, Drive Type Hex