I used this to cut 1/4" grooves in hemlock to make 1/4" hemlock backing for 3/4" X 1 2/3 "Inch Floating Canvas Picture Frames. My first cut was too deep, maybe about 1/2". It took considerable effort to drive it to that depth. Once I got the right depth (1/4"), it was relatively easy to push through. Left a clean cut at both depths. I've pushed through about 16.8" boards and they're still sharp with no sign of burning or dulling. . If you do a lot of router work, I recommend a heavier bit and a 1/2 inch shank.