Screw Extractor Set, Extractor Type Spiral Flute Screw Extractor, Number of Pieces 3, Drill Size 1/4 in, 13/32 in, 17/64 in, For Bolt Size 7/16 in to 1 in, Material - Machining High Speed Steel, Overall Length 2-7/8 in to 3-3/4 in, Container Type Tube, Drive Type Square