When you are using the Hooked dogleg gouges, you need to figure out how to twist and turn your way through the material. If you do, this tool will be very effective.
The shape of the edge is indicated by a width (in mm) and a diameter (in mm). The shape of the edge is a part of a full (imagined) circle, where the diameter is the inner dimension of this circle. For instance 22-16-14, where 22 is the total length of the tool, 22 cm. 16 is the shape of the edge, with 16 mm in diameter. 14 is the width of the blade edge, 14 mm.