Drilled holes too large for potentiometer mounting...

[Ben N]

Downside is that you can't part drill the next step up to form a countersink which can be done with the ones that skip a size.

Also, it isn't suitable for drilling depth more than 4-5 mm (distance between 2 consecutive step sizes..)

Agreed, I have others, but this one is very handy, and it costs about 1/5 of EACH of the single size bits I had begun to accumulate out of desperation.