Size: 1/8inch, 5/32inch, 3/16inch, 7/32inch, 1/4inch, 13/32inch, 9/32inch, 11/32 inch, 3/8inch, 5/16inch, 13/32inch Made of high-quality chrome vanadium steel, and treated with heat , with high hardness and wear resistance. This screw extractor set is designed to remove broken studs and studs. perfect for removing damaged or stripped screws, broken studs, threaded tube, pins, socket fittings, fittings, bolts, etc. Material: steel Color: Black Package Contents: 10 screw extractors Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.