You choose wall plugs based on the thickness of the screw, not the length. Search for wall plug on Wikipedia, I know there's a quick reference guide there.
It appears to be a spikskruv, meaning a screw that you drive in but can then unscrew.
The tip of the screw should go all the way through the bottom of the plug, so the screw should be the length of the plug plus the thickness of the fastened material plus at least the length of the screw tip.
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