Quick introduction to die grinders, Roloc discs, and carbide burrs

Just a quick introduction to my Milwaukee die grinders, Roloc discs, and carbide burrs.
Although not covered in the video, mounted points (rotary grinding stones) are also widely used in die grinders.
For those of you who haven't come across die grinders etc., this is a simple introduction.
Die grinders have been around for a very long time. They were extensively used in the production of press tooling.
Originally most were pneumatic, now more and more are electric and battery powered.
For years I've used pneumatic die grinders, but now have moved to battery powered.
Carbide burrs are very handy for cleaning out an old weld prior to rewelding.
I dare say that Artist Blacksmiths would fine die grinders an invaluable tool.
Die Grinders featured:
Milwaukee M12FDGA-0 angled die grinder
Milwaukee M12FDGS-0 straight die grinder
Milwaukee M18FDGRB-0 die grinder