KLEIN TOOLS, Metric, 10 mm/5.5 mm/5 mm/6 mm/7 mm/8 mm/9 mm Tip Size, Hollow Shank Nut Driver Set - 2DGN2|65160 - Grainger
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JOYKK 5.5mm Metal Socket Driver Wrench Screwdriver Hex Nut Key Nutdriver Hand Tool - Black+Green+Silver : Amazon.co.uk: DIY & Tools
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