I was trying to install a door viewer on the front door. While I was trying to drill the 1/8" pilot hole to make way for the 9/16" spade bit (as per the peep hole installation instructions), the 1/8" drill bit broke and I could see that the door seems to have a metal cover.
Could somebody suggest how I can drill the 9/16" hole to install this peep hole at the front door. I am using the bits with a 14.4 volt cordless drill.
Help would be greatly appreciated.
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