Set #6 in this series is double incut, meaning that the steeper your wall gets, the more the second incut comes into play. They are V2 holds on a 45-degree wall and V0 on less steep walls. They are incut enough to use on roofs which will feel in the V3/4 range.
Three angles to the incuts allow you to bite down with your fingertips into the double incut.
Set#6 is a wider version of Set #5.
In this series, Set #1 is the least incut, and Set #6 is the most incut.