IVY Classic 41018 Swift Cut 6-1/2-Inch x 1/8-Inch x 5/8-Inch Diamond Knockout Arbor, Masonry Cut-Off Blade for Circular Saws, 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: 6-1/2-inch, Width: 1/8-inch, Arbor: 5/8-inch Diamond Knockout, Max RPM: 9,400