General description Made of chrome vanadium steel, these 11 pieces damaged screw extractors are designed for high hardness, rustproof durability, and sturdiness. They are ideal for removing damaged, rusted, or stripped metal screws, studs, bolts, fasteners, faucets, and water pipes. The recommended drill bit diameters and extraction diameters for broken screws are engraved on the housing, ensuring ease of use. Technical specifications Material: Chrome vanadium steel Includes: 11 pieces Usage Ideal for removing damaged, rusted, or stripped screws and bolts Drill bits can also be used for drilling holes in wood, metal, plastic, brick, and walls