Use the short wedge to push the striker cylinder nub inwards, and the long wedge to push the nub downwards. The other part is used for reinstallation of the striker and backplate.
See https://www.sigguy.com/product-page/sig-guy-p365-striker-removal-tool-365srt (Sig Guy P365 Striker Removal Tool) to see how to use the toolkit in more detail
The author remixed this model.
Modifications to the original file:
1. STEP file so it's easier to modify
2. Inclusion of the two wedges that can be found in commercial offerings of the same toolkit