I see these listed for sale. What are they, how are they used? Are there different ones for different planes? Is it only a cessna thing?
TIA
https://www.ebay.com/itm/142976797215?epid=27011219775&hash=item214a14ca1f:g:M3IAAOSw2tNbvN4K
TIA
https://www.ebay.com/itm/142976797215?epid=27011219775&hash=item214a14ca1f:g:M3IAAOSw2tNbvN4K
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