Similar: 6-7 years ago, I got a 121-piece index, from Northern Tool. It was $30…
I used a 1/8" bit, to drill thin aluminum… and it wasn’t up to the task, and it flexed and broke. It flexed, even though it was a straight press.
I saw the flute tip, and the edges had rounded-off…???
I took the stub over to my grinding wheel, to sharpen it, and noticed the sparks indicated cast iron.
I know the spark pattern of various steel alloys, but I was SURE I had it wrong. Got a chuck of cast iron, lying about… sure as god made little green apples, the spark pattern was the same.
In utter disgust, the index and the remaining 120 bits went directly into the recycle bin.
Allen keys are similarly rubbish. Started work on a small grub screw once thinking it was coming easily I looked down and noted a nice helix had begun forming in the Allen key shaft. Paul.