Engineered specifically for aluminum applications, this Type 27 flap disc offers exceptional performance with a grit rating of 36, making it ideal for grinding and finishing tasks. Manufactured by CGW Abrasives, the disc features a unique design that incorporates aluminum oxide treated with calcium stearate, which helps maintain a cooler operating temperature and reduces loading when working with softer materials. With a size of 4-1/2 x 5/8-11 and a maximum RPM of 13,300, these discs come in a convenient box of 10, ensuring you have plenty on hand for your welding and gas essentials projects.