I cannot tell you what size it is but if I was you I would buy a set with an inter changeable handle. A set with 5 to 10 Torx with the one you need in it should not be that expensive.

The next time you need a Torx odds are it would not be the size you bought.

Also try to get the security type re: there is a hole in the center of the bit.
Manufacturer's are staring to use a Torx that has a pin in the center so that a normal Torx will not fit in.

I have a set with a two way handle, 8 Torx and two flat and Phillips bits that set me back about $10.00.

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