Selecting the right wheel requires matching the abrasive material (e.g., Aluminum Oxide for steel, Silicon Carbide for non-ferrous metals) to your workpiece. You must specify the grit size (coarse for rapid stock removal, fine for surface finish), grade/hardness (softer wheels for hard materials to ensure self-sharpening), and bond type (Vitrified for precision, Resinoid for heavy-duty grinding). Always verify the Maximum Operating Speed (RPM) to ensure it exceeds your machine's spindle speed for safety.