Reply by helluvawreck

I bought my set at Lowes and they were not very expensive I don’t recall any problems with them and it does help to mark the hole with a punch in a lot of cases just like you would if you are drilling a hole in steel with a regular twist drill.

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau