after a
ridiculous amount of digging:
T5 Security Torx:
https://www.ebay.com/itm/142549642884https://i.ebayimg.com/images/g/kGUAAOSwt0tZe02Y/s-l500.jpgT6 Security Torx:
https://www.ebay.com/itm/322475002072T3 through T10, (7+ being security) PLUS two sizes
below T3:
https://www.ebay.com/itm/322449844391https://i.ebayimg.com/images/g/hzsAAOSwFqNZScKO/s-l1600.jpgI saw some of the little drivers like you ran into, I'm looking for something that fits into my hand as I'm not five years old and tend to fumble itty bitty drivers like that. It's also hard to keep the right amount of force on them while using them and that risks stripping the screw head if it's stuck. (been there, done that, REALLY not fun)
Funny I could not find either model in both T5 and T6...
And
here is the unicorn.... a full set of 4mm "micro bits" that go T3-T20, with security starting at T6:
https://www.ebay.com/itm/332344579438https://i.ebayimg.com/images/g/2asAAOSwHptZABxq/s-l1600.jpgI will have to wait for those, but I can use them to supplement my good ifixit driver set and nice ratcheting super-grippy driver I got from another set. (because the handled driver from ifixit has terrible ergonomics, as do MOST other 4mm drivers)
And I like that seller.... he's selling what looks like my iFixit 54 bit set for an
insanely low price. If you don't have one of these, GET IT.
https://www.ebay.com/itm/332275083454if you like tools, his limited offering has a lot of interesting items worth browsing over.
I was unable to find a T5H (T5 with hole in it) in a 4mm bit, and not able to find T4 or smaller in security form at all.
FYI nothing beats Wiha for ergonomic driver sets, and they have great small phillis and torx sets, but they don't seem to carry ANY security torx.
And wow, MCM Electronics is now owned by Newark Electronics. I think that's where I got my micro ratchet from but can't find it on their new cluster of a website.