These tools are modified versions of the Onsrud 52-200 wood cutting bits. The tips of these tools have smooth half moon rounded top. These ball nose tools are ideal for 3D routing because the ball nose does not leave any harsh corners or lines.
Robb Jack B-203 series - 2 Edge Upcut Spiral Ball Nose - Solid Carbide
Onsrud 52-200B series - 2 Edge Upcut Spiral Ball Nose - Solid Carbide