I needed something to drill an 1-1/2" hole in some C-Channel in my cheap menards drill press.
These were a little pricey but have worked really well.
Hougen 11 87 Fractional Rotacut Combo Kit - 19 Piece, 5/16 to 1-1/2 Inch - - Amazon.com
These were a little pricey but have worked really well.
Hougen 11 87 Fractional Rotacut Combo Kit - 19 Piece, 5/16 to 1-1/2 Inch - - Amazon.com