Star M, High Speed Steel Countersink and Plug Cutter Set

I’ve been looking for an accurate, clean plug cutter and countersink set for a while. I actually started to think my old clunker of a drill press was the problem, turns out it was just my drill bits!
These are so clean on hard and soft wood. They work with ease, I highly recommend them.

I already have 20 plug cutters of various sizes and cutting styles.This is because they are all stand alone cutters to which you must match the drill. On my most recent job only one of my 25mm drills was anywhere near a snug fit so I was keen to try your tool.After trying the 9mm set I immediately ordered the 10mm(I would have taken any other sizes if I could!)
These work because 1. They are engineered as a pair so that the plug sits snugly in the hole and
2.the design of the cutting surfaces ensures that both plug and hole have very clean edges.
What to do with a box of useless cutters?

Quality