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Forged from high-density chrome-vanadium steel to provide an equal blend of efficiency and durability, the STANLEY 69-230 Allen key set is designed to help you easily fasten screws, nuts, and bolts that have hexagonal driving slots. These Allen keys are coated in a black, corrosion-resistant substance, which safeguards the metal against rusting and extends their lifespan. Additionally, these Allen keys’ chamfered edges enable nearly effortless screwing and help wrench out rusted screws without damaging the surface to which they are attached.