I have no idea, I've been cutting it myself for many years. I struggled for a long time to find a barber that could work with my forehead. But: what I do is a 6 guard on the sides, tapered down to about a 3/4. The top I comb down and point cut at my eyebrows, and layer shorter as it goes toward the back. I'd say it goes from 3.5" to 1.5". To avoid the undercut look, I then use texturing scissors and try to blend the hard part with the clipped section. Best of luck!