I bought this set of 6 mm bits because, in addition to all the odd forms, it contained a complete set of miniature sockets, 2.5 - 5.0 mm by 0.5 mm steps.

I noticed that there was an extra "socket". Not a conventional hex, it looked like a female die for making the tip of a Philips head screwdriver

and, indeed, perfectly fit a #2 Philips bit.

What sort of fastener is this bit meant to fit or does it have some other purpose?
I noticed that there was an extra "socket". Not a conventional hex, it looked like a female die for making the tip of a Philips head screwdriver
and, indeed, perfectly fit a #2 Philips bit.
What sort of fastener is this bit meant to fit or does it have some other purpose?
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