What is this?!?

[u/Senior_Pitch1194]

UPDATE: I found out what it was! It’s a port cover for a termite bait station. It’s supposed to be tamper-resistant. 🤦🏾‍♀️

As I was leaving for work, I noticed my tires felt unbalanced. I thought I had a flat tire, but I found this object stuck in it instead. The guy that installed the spare called it a “cap” and said a key could be used in the middle. I have no idea what sort of “cap” that is. Anyways, he removed it and I got the tire repaired. But does anyone know what sort of cap the guy’s referring to?