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I have never seen a screw head like the one attached. My local hardware store directed me to get different T heads (T6, T8, T10, T15, T20, T25) and try them until I find a match. None of them work though because as you can see from the picture, in the middle of the star there is a raised seed that prevents the driver from entering the head and engaging the star edges.

What can I use to unscrew this?? enter image description here

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Looks like a "Tamper-Resistant Torx" screw, according to http://resources.tannerbolt.com/articles/what-type-of-screw-is-this/ . Another name is "Torx Security" screws. I get some good results on Amazon for Tamper Proof screws too.

Test what size was closest (diagonal fit) to get the approximate size you need. Probably the best action is to buy a whole set of interchangeable heads for your screwdriver.

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    You are correct, I have a set of those bits. – Moab Oct 3 '19 at 3:19
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    I have a set too. They were less then $7 on special from my local hardware megastore. That said, depending on the size and tightness I have defeated these screws with a standard small flathead screwdriver wedged between spokes 1 and 3 (or 2 and for or whatever) – davidgo Oct 3 '19 at 11:17
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    Usually the center pin is so weak anyways that poking into the screw with a pointy object like a small flathead screw driver will break it off and allow using a regular torx bit afterwards. – WooShell Oct 3 '19 at 11:34
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    @WooShell Keep in mind that this process is irreversible, so it definitely leads behind evidence of tampering, in case this may be relevant further down the line. – Lucas F. Oct 3 '19 at 13:12
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    @Dai - It used to be that TR Torx couldn't be bought at your neighbourhood hardware store; they were a specialty item. The first time I remember seeing them was on a cable tv box (1980's?). I couldn't find a source for an over-the-counter bit set and ended up making my own. Now that they are more universally available, I guess no one thought to change the name. – user385793 Oct 4 '19 at 12:12

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