English: The most common metric hex key sizes, also known as the 1st choice metric key sizes, which are sized at intervals such that it should not be possible to use a key with the wrong size, thereby reducing the risk of damaging either the screw head or the tool itself if the wrong tool should be used.
Norsk bokmål: De mest vanlige metriske størrelsene for sekskantnøkler. Disse er også kjent som «førstevalgs»-størrelser, og er lagt opp i intervaller slik at det ikke skal være mulig å bruke en nøkkel med feil størrelse, og reduserer dermed faren for å skade enten skruehodet eller verktøyet i tilfelle feil verktøy blir brukt.
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