They are Recur Innocence 4.5 inch diamond blade for angle grinder convergence stack violinist
Gunpla 3 Pieces 4-1/2 inch Diamond Cutting Blade Continuous Segmented Turbo Rim Dry Wet Circular Saw Cutter Angle Grinder Disc 7/8 inch Arbor with Reducing Ring 5/8 inch for Tile Masonry :
ToughGrit™ Diamond Blade for Angle Grinders (4.5") - WonderBlade™
(3 Pack, 4 ½ Inch) GRAFF Diamond Blade for Angle Grinder - Diamond Cutting Wheel for Cutting Stone, Marble, Granite, Brick, Masonry, Paving Flag, ...
4.5 Inch Metal Cutting Blade Angle Grinder Diamond Blade for Rebar, Piping, Cast Iron, Ferrous Metals, Steel