Engineered specifically for aluminum applications, these Type 29 flap discs provide exceptional performance with a grit rating of 60. Manufactured by CGW Abrasives, each disc features a unique design that incorporates aluminum oxide treated with calcium stearate, ensuring cooler operation and reducing the risk of loading when working with softer materials. With a size of 4-1/2 inches and a 5/8-11 arbor, these discs can handle an impressive RPM of 13,300, making them an ideal choice for welders and fabricators seeking efficiency and quality in their abrasive tools. Each box contains 10 discs, offering a reliable solution for your welding and gas essentials needs.