High-performance aluminum oxide grain offers long life and aggressive material removal, suitable for 1/4" mandrels and up to 13,300 RPM. Low vibration design ensures operator convenience and longer usage, ideal for metal fabrication, auto shops, maintenance, and construction. All-purpose grinding disc for edges and surfaces with excellent stock removal rate, ideal for cleaning, rust removal, deburring, and polishing. Depressed center design for aggressive grinding and smoother running wheels, perfect on solid construction steel, tool steel, and high-speed steel. Outstanding grinding discs 4 1/2 for angle grinder for stock removal rate and easy to use. No clogging, no chattering. KSEIBI Metal Stainless Steel Inox Grinding Disc Depressed Center Grind Wheel, 7/8-Inch Arbor