|Synonyms:||Allen keys, Allen wrenches;|
DE: Inbusschlüssel, Imbusschlüssel,
|Location:||metal workshop; drilling table|
|Similar (More or Less):||hex screwdriver bits, hex screwdrivers, Torx keys|
Hex keys are used to fasten internal hex drive screws.
Besides metric hex drives in (half) millimeter steps, non-metric screws are relatively common so make sure the key you are using actually fits! Round keys don't work too well anymore...