The nut extractor is made of chrome molybdenum steel, with high hardness, ensuring a service life and durability 3/8 inch opening reverse screw damaged/rusted nut screw extraction sleeve provides maximum grip and easy removal of damaged or rusted nuts, screws and . The surface is electroplated and blackened, which is corrosion resistant and rust resistant, and has high hardness after secondary heat treatment. color: Black material: metal Package Contents: 13 x Bolt Nut Remover 1 x Hexagon screw socket 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.