Review on Degree Industrial Countersink Deburring Pieces by Drew Panah

This is complete bullshit, at least in the form in which they came out. They have an absolutely terrible cutting edge, perpendicular to the axis, and it seems that they are not sharpened at all, but simply drawn. Because of this, they constantly stick together and begin to rub just for a moment after cutting. I haven't grounded them yet, but I think they could be used if grounded, but don't waste your time on that.