IVY Classic 41012 Swift Cut 4-1/2-Inch x 1/8-Inch x 7/8-Inch Arbor, Masonry Cut-Off Blade for Grinders, 1-Piece Designed to cut brick, concrete block, slate, tile and other masonry products, Swift Cut (Registered Trademark) Resin bonded Silicon-Carbide grain for faster cutting, Type 1 blade - for cutting only Blade double reinforced with fiberglass mesh for durability and safety Arbor reinforced with metal for extra strength Diameter: 4-1/2-inch, Width: 1/8-inch, Arbor: 7/8-inch, Max RPM: 13,200