Irwin Marples Wood Drilling Forstner Bit, 2"


Irwin Marples Wood Drilling Forstner Bit, 2"

There are 2 different Irwin Forstner 2" bits offered.
Does anybody here know the difference, and which is which?

The only difference I can see is the marples has some serrations in the picture. Don’t know what that means in terms of performance difference.