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9 Hex Allen Keys that are designed to let you avail to advantages that are important in fastening jobs. You can use the these to extract more torque for fastening tasks with ease.These Allen keys are made of high-grade alloy steel and are hardened and tempered so that you can perform tough fastening jobs without damaging the keys.These hex keys are coated with black oxide to make them resistant to corrosion so that their durability is enhanced.