Thats the cutting face width of the tool. The tools faces almost always have .005+ wide flat tip. That will show you the thinest line the tool will make. The reason for no sharp points is to keep the tool tip from chipping off while cutting. Without it they would be to weak.
OK, thanks. The non-sharp tip makes sense, otherwise the tool offset for the next pass would have to be really small making things slow? Haven't seen other brands which allow you to define the measure b, they all seem sharp as a needle - at least in pictures.