This is the E10 Torx tool to undo/tighten the bolts on the vacuum hub.
Sold as a kit, including the 1/2 driver bar, this can be kept in the glovebox of your Jimny so that you can emergency "repair" your vacuum hub when it fails just when you need it.
See this article on a "Field Fix" - https://www.bigjimny.com/index.php/bigjimny-blog/problems/entry/150-51009-fixing-a-vacuum-hub-in-the-field-v15-208
Get one for your Glovebox/Toolkit now!
Consists of:
1. Long reach E10 Torx (suitable for impact driver). 1/2" fit.
2. 250mm 1/2" wrench bar