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I need to unscrew the screw in this picture. It doesn't seem to be using a standard fitting however. What screwdriver so I need for this?

enter image description here

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up vote 7 down vote accepted

You need a Torx bit also sometimes referred to as star drive.

You may be able to get a fixed screwdriver with the right size one but it's generally a better deal to just get a bit assortment and mount an adequately sized one on some sort of a socketed shaft, depending on the application.

enter image description here

Note: Torx drive invented originally by Camcar Textron to eliminate the rounding issue standard hex drive bits suffer.

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