4-1/2x1/8x7/8 masonry. For use on angle grinders. Industrial grade silicon carbide grinding wheel for heavy-duty cutting, grinding, and other masonry removal operations. Double reinforced for increased life and faster cuts. Ideal for low angle and vertical grinding. C24R grit. 4-1/2" x 1/8", 7/8" arbor, 12,000 RPM