Roloc Bristle Disc Grade - 80#, Size - 2 Used on automotive aluminum and metal Diameter: 2 Inches Rotates and spins at maximum speed of 25000 RPM Grit 80 Grade Roloc Bristle Disc Grade - 80#, Size - 2 Used on automotive aluminum and metal Diameter: 2 Inches Rotates and spins at maximum speed of 25000 RPM Grit 80 Grade