Review on Ultimate Precision: Radius Carbide Cutter Router Milling by Besim Kahsar

The description at the top of this product listing lists cutter diameters as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm and 3mm. That's the basis I bought them on. Find out what RADIUS quantities are. Who measures bits by radius? Thus, the actual cutting width is twice as large as the specified one. Of course I now see that the description at the very bottom of the listing says the dimensions are radius. Complete confusion and confusion.