Perma-Grit’s cutting disc RD2 cutting Plexiglass using a Dremel battery charged drill

Ian Richardson of Perma-Grit Tools demonstrates cutting Plexiglass, using the Perma-Grit tungsten carbide grit cutting disc RD2 32mm (1 1/4”) Disc with 3.1mm shaft. www.permagrit....
The PermaGrit disc cuts fast and clean, it does not heat up and cause Plexiglass, Perspex or Lexan etc. to melt. Powered by a Dremel battery drill, Proxxon or a Flexi-drive the result would always be good.

[@imussimussnot3399]

How can I get a set of those bits?

[@Killuminati-X]

Which bit is that