The NFU is a unique and only avaialbe from Mafell! It is used to cut both dado's and grroves. Has a 2 piece adjustable cutterhead. The width of cut can be adjusted from 5/8" to 1 1/16". Also featured are side cutting scoring knives which cut both sides of a groove for a very sharp, clean surface. Maximun cutting depth is 1 1/4" and can be used with our various guide tracks.