It's a T40 plus. Total pain in the ass to find in a store, but you can order one:
http://www.mactools.com/shoponline/p...us-driver.aspx
For your reference:
http://en.wikipedia.org/wiki/Torx
Quote:
A Torx variant, Torx Plus, introduced about 1990 when the original Torx patent was expiring, is designed to allow greater torque, and to minimize wear. The specifications for these licenses are held by Textron. Standard Torx drivers can be used to drive Torx Plus screws, but not to full torque because of the loose fit. Torx Plus drivers will not fit standard Torx screws. They are shortened to "Torx TX".
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