nostr:npub1v7t4yx9vxtv3mat0hdsduuym4fvjd5dzmdlh82ssa40phr965h2s2lck6k diamond will cut anything. the only thing idk about is aluminum- it may gum up the wheel. you'd have to try it out.  diamond can cut steel though.

certain abrasives work best on different materials- AlO2 (the black ones) are good for steel. aluminum gums them up