Infinity Tools 1/4" Shank Floating Lettering Bit

I was a little skeptical about how it would handle the 1/8" undercut, but the carbide edge left a clean, crisp line through the letters on the first try. The 1/4" shank gripped solidly in my router, and the floating action kept the depth consistent even on a slightly curved sign face.

The undercut it creates is a perfect crisp 1/8" groove, and it tracks my existing lettering without any drift—even on a tricky curved sign I tested it on. The carbide edge held up through a full afternoon of routing without dulling, which honestly surprised me.

I’ve been using this floating bit to add depth to carved letters, and the 1/8” x 1/8” undercut is spot-on every time. The 1/4” shank runs smoothly in my router, making the whole process feel precise and effortless.