● 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.