Removing rivets.

[CraigCam]

I'm removing the inside panels of my 1970 overlander, 99% of them are aluminum pop rivets, that are easy to drill out. There are a few that are shinny and almost impossible out. Any idea what these are, how to drill them out and why are they there?

[HiJoeSilver]

They might be spinning with the bit so the bit doesn't bite and actually drill them. If that's the case I usually tipped the drill so it was at an angle so it could get a bite without simply spinning the rivet.
Photos if not?

[overlander63]

They're probably stainless steel rivets.

[blkmagikca]

Consider http://www.vintagetrailersupply.com/...-p/vts-497.htm for removing rivets.

[woodfox45]

If they are stainless you will need a carbide drill bit.

[Chae]

You can get a center punch and put a small divot at the center of the rivet head so your drill bit can get a better bite. I got mine from Amazon.