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no idea if bikeinn are legit but https://www.bikeinn.com/bike/msc-hex-tool-adaptor/136490458/p
or bike24 https://www.bike24.com/p233270.html
or even better https://www.sjscycles.co.uk/tools/topeak-replacement-8mm-bit-for-xtoolplus/
8mm no? It's a hex/Allen embiggener (rather than a socket) to fit on the end of a 6mm hex key to enable you to tighten up crank bolts on the road.