Review on Efficient and Versatile Countersink Baban Degree 6mm-19mm by Moworve by Richard Simmons

I bought this set to have quick change countersinks for woodworking. I already have a good countersink. But having to switch between drilling pilot holes, countersinking, and screwing requires quick-change bits, which I already have for drilling and screwing. Unfortunately, these countersinks were unusable in the form supplied. First, the cutting edges were quite blunt. This can be corrected by sharpening, which I did. However, there is no undercut in the design behind the cutting edge and the edges are parallel to the axis of rotation and not inclined like other countersinks. So the design doesn't pull the chips away from the cut - they just get stuck in the small gap between the flutes, making cutting very inefficient.