I had to drill out the rivets on my water heater tank to install a new tank. I used a countersink bit1/2" bit
Worked perfect on the aluminum rivets. No guessing what size drill bit to use. Drill slow until you see the rivet flange start to spin then you know your done.
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“I have tried to live my life so that my family would love me and my friends would respect me. The others can do whatever the Hell they please!” —John Wayne
A countersink bit does work great, as Kevin says. I used one about 10 days ago to remove the old electrical cord access plate when I changed it out for using a removable cord.
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2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln