Star M, High Speed Steel Countersink and Plug Set

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

Quality

Really well made set. The plugs fit absolutely perfectly, even on a Dewalt countersync drill bit. Only reason I gave it 4 stars is the hex mounting portion seems to be too long so it doesn't lock into my Makita driver collar. I might end up grinding away some of the material at the back to get it to lock properly. All other bit sets from various manufacturers fit the Makita so I am assuming this bit set follows a different standandard. Still I would highly recommend it.

It is great to use and the plugs fit so snug. It is great highly recommend.