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This 9 piece ToolPro Short Arm Imperial Hex Key Set is designed to efficiently tighten and loosen hex screws. Engineered with chrome vanadium steel, it is corrosion and wear resistant, making it ideal for DIY or professional projects. The set is housed in a convenient holder that locks securely and has labelled size markings for easy identification. The included sizes are: 1/16, 5/64, 5/32, 3/16, 1/8, 3/32, 1/4, 5/16 and 3/8.