English: Illustration of safe hex key sizes (left and right) for a given hex head screw (middle). Metric 1st choice hex keys 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: Illustrasjon av trygge nøkkelstørrelser (venstre og høyre) for en gitt skruehode-størrelse (midten). Metriske førstevalgs-størrelser er lagt opp slik at det ikke skal være mulig å bruke en nøkkel med feil størrelse, og reduserer dermed faren for at man kan skade skruehode og verktøy ved å bruke feil nøkkel.
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