Engineered for efficiency and longevity, the Maxidisc™ Aluminum Oxide Premium flap disc is specifically designed to excel in applications involving soft non-ferrous metals such as aluminum, copper, brass, and bronze. With a diameter of 4-1/2 inches and a grit step of 60, this Type 27 disc offers remarkable production rates, outpacing traditional flap discs thanks to its unique formulation. Each box contains ten discs, each capable of achieving a maximum RPM of 13,300, ensuring that you can tackle your projects with speed and precision. Crafted from high-quality aluminum oxide and featuring a calcium stearated coating, this disc not only delivers twice the lifespan of standard options but also minimizes loading, making it an ideal choice for demanding metalworking tasks.