It consists of two sub-tools for the rotating diopter drum rear sight adhustment (for higher/lower and right/left adjustment).
Table of contents
Stgw 90 rear sight left/right adjustment tool
Wenger Stgw 90 rear sight higher-lower adjustment tool
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Victorinox FASS 90 rear sight higher-lower adjustment tool
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The right/left adjustment sub-tools seems to be the same for Wenger and Victorinox models.
But the higher/lower adjustment sub-tools have some difference in design (see photos).
The front scale of the knives has several markings that indicate how to use the sight adjustment tool.
Using the sight adjustment tool
Video on YouTube - Victorinox 'Korrekturmesser für Stgw 90' (SIG 550, FASS 90) usage.