What is this on my rock?

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dman2182

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Hello All,
Long time reader, first time post… Can anyone help me identify what this grey looking critter is on my rock? I first found it 4 days ago, then it moved over night and came back this morning and it’s back. Any help much appreciated. I just would like to know if it’s harmful or harmless. Thank you!

IMG_8587.jpeg IMG_8589.jpeg IMG_8591.jpeg
 
Thank you! Yes it does after looking up what a chiton is.
Are they harmless? Most things I just read said they are harmless.
Harmless clean up crew. Good hitchiker!
 

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