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"Set screw" means the same as "grub screw", i.e. a bolt where the entire thing is threaded, and the head is set within the bounds of the thread, not proud of it.

Like this: https://ever-hardware.com/wp-content/uploads/2017/03/Torx-se...

Torx grub screws are super uncommon, I don't think I've ever seen one. Usually they have a hex socket (for an allen key), or occasionally they're slotted (for a flat-blade screwdriver).

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I think they are uncommon because torx drivers are always bigger than the head of the tool. They always taper down to the size as part of the design, so that doesn't work well for most applications.

That’s a good point. It means that whoever sells the elusive torx set screw would then get to sell the matching elusive torx set screw driver!

I can get a straight torx screwdriver with shaft diameter smaller than the screw at my local hardware store. No need for worldwide shipping, I can get that on bike. There exist also torx bits with long shaft.

My mistake. I read "set screws" as "set of screws".

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