Rivet or ?

[mainsailman]

I have these fasteners throughout the boat in all of the wood that is attached to the fiberglass body. Are these rivets or what? btw...the center is not white...just a glare from the flash that I could not get rid of.
http://imgur.com/zzdGDzT

[Privilege]

Does it have a threaded center? I can't tell from the photo. If so, it's a rivet-nut (aka rivnut). It works like a rivet but once it's fitted ,a bolt can be inserted.

[mainsailman]

No the center is smooth. That was the outside (decorative) side of it.

[Blue Stocking]

When the center pin is pushed in flush, it expands the segmented cylindrical tube attached to the outer ring. Usually sacrificial on most panel work.

[Cheechako]

it appears to be a common pop rivet....? wierd