Size: 2 inch overall diameter x 1/4-inch arbor shoulder mandrel (5.1cm x 0.6cm) to get into tight spots and fit standard 2-inch angle grinders (no backer needed for installation). Maximum 12,000 to 14,000 RPM speed Package Include: 30 PCS Assorted 40/60/80 Grit, Each 10 Pcs Quick Change Flap Disc Remove Heavier Stock: Angle grinder sanding wheel is designed for working on flat surfaces, it is coarser in build to easily remove heavier stock, smoothing out or blending autobody paint, deburring, removing rust, leveling, stripping, buffing, light grinding, and prepping or finishing flat work surfaces such as stainless steel, aluminum, and non-ferrous metal. Avoid forcefully pushing down on flap disk to prevent wear or damage The grinding wheel is made of high quality zirconia and aluminum oxide. Good for cleaning, deburring, removing rust, leveling, stripping, polishing, light sanding and preparing or finishing flat work surfaces. Torque Spiral Design, The connection between the grinding