Designed specifically for working with soft non-ferrous metals, the Maxidisc™ Aluminum Oxide Premium flap disc excels in performance and durability. Featuring a calcium stearated coating, this 4-1/2 inch disc is engineered to deliver twice the lifespan of traditional flap discs when used on aluminum, copper, brass, and bronze. With a grit step of 36 and a maximum RPM of 13,300, it ensures higher production rates while maintaining a cost-effective solution for your abrasive needs. Packaged in boxes of ten, these Type 27 discs are an essential addition to any toolkit focused on efficient metalworking.