When selecting angle grinders for industrial or retail distribution, prioritize motor power (wattage) and disc diameter. For heavy-duty masonry or metal cutting, a motor of 1200W to 2500W is essential, while 600W to 900W suffices for light DIY tasks. Ensure the No-Load Speed matches the disc size; typically, 4.5-inch grinders run at 11,000 RPM, whereas larger 9-inch models run at 6,500 RPM to prevent disc disintegration. Always verify the use of high-quality carbon brushes and copper-core motors for extended tool life.