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September 6, 2015 at 12:39 pm
#23325
They are called "Drive Screws" http://www.mcmaster.com/#drive-screws/=ytinkz
In the future, instead of drilling them out, IF the hole goes all the way through, you can punch them out from the rear and re-use them. I have also removed them by hacksawing a slot in the head and twist it out with a screwdriver.