He's using a saburrtooth disk there which are slightly less insane than one of these:
https://youtu.be/ugznwt0O5j8
Basically 3 plane blades welded to an angle grinder disc.
Christ. That very much looks like it would grab and fly out of your hands :)
@christianSpaceman started
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He's using a saburrtooth disk there which are slightly less insane than one of these:
https://youtu.be/ugznwt0O5j8
Basically 3 plane blades welded to an angle grinder disc.