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If you stick a 6mm in and it immediately fits, it's not a DT Swiss.
The opening of a DT Swiss is round, and slightly larger than a 6mm hex. Looking in the opening, there's an o-ring, and under that you will see the actual 6mm hex. This is the lever retention system and the 6mm thru axle. When used with the DT Swiss lever, it allows the lever to stay in place.
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