Cartridge Roll, Cartridge Roll Design Straight, Pilot Hole Diameter 1/4 in, Abrasive Material Aluminum Oxide, Abrasive Type Coated, Series R228, Backing Material Cloth, Backing Weight X, Grit 80, Maximum Operating Speed 18,000 RPM, Overall Diameter 3/4 in, Overall Length 2 in, Color Brown, Grade Coarse