The nut extractor is made of chrome molybdenum steel, with high hardness, ensuring a longer 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 bolts. The is electroplated and blackened, which is 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.