This cutter is designed to cut perfect concave grooves.
Thanks to the technical feature of this tool, it can enter the wooden piece deeper than the profile of the knive.
3 different radius knives can be fitted on this cutter.
On the smaller cutter it is possible to fit the knives of radius 1 2,5 mm, 1 5 mm and 1 7,5 mm, while on the bigger one the knives of radius 20 mm, 22,5 mm and 25 mm.