The larger bit was my favorite! I created a flower bed around a crape myrtle tree that had lots of small, bushy roots! My first try was with a shovel and I gave up! Ordered auger drills hoping they would get the job done. The large cutter was very easy to work with and really made a nice deep planting hole. In my opinion the tip of the drill needs to be sharper to dig such a hole! Other than that, my digging and landing with this drill along with my drill was awesome! Now I will use it for all my plantings!