The TOLSEN 9PCS Extra Long Arm Hex Key Set is designed for precision fastening and loosening of hexagonal screws in various applications. Crafted from high-quality Chromium-Vanadium (Cr-V) steel, these keys are heat-treated for enhanced strength and durability. The extra-long arms provide increased leverage, making it easier to apply torque in tight spaces. The chrome plating offers corrosion resistance, ensuring longevity even in demanding environments.