Engineered specifically for aluminum applications, these Type 27 flap discs from CGW Abrasives offer an exceptional balance of performance and durability. With a size of 4-1/2 x 7/8 inches and a grit rating of 36, these discs are designed to operate at a maximum RPM of 13,300, ensuring efficient material removal. The unique formulation features aluminum oxide treated with calcium stearate, which helps maintain cooler operation and minimizes loading when working with softer materials. Packaged in boxes of ten, these flap discs are an essential addition to any welding or gas essentials toolkit, providing reliable and effective abrasive solutions.