He probably sketches a line to follow that he can see through the bottom of the router. It's probably around 3/4 inch bit, it just needs to be wide enough for the LED rope, so maybe 1 inch. It would take a couple passes to get that depth, but the first would be the hardest.
It's a "trimmer" (like a router but smaller, thus less expensive) to make a "canal" where to place a LED strip.
Oh interesting! Okay and what kind of bit do you think it’s is?
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