So I was just looking at this website, and came across these really cool, single piece wood wallets. But since I'm a total newbie to woodworking, I'm not sure how the artist made the deep groove cut where the cards and such go.
http://www.slimtimber.com/products/maple-wood-wallet
I assume it's a router, or a CNC, but since it's such a deep cut I wasn't sure. And if it is a router, what kind of bit do you think is used?
If anyone can enlighten me, I'd really appreciate it!