IVY Classic 40080 Swift Cut 6-1/2-Inch x 3/32-Inch x 5/8-Inch Diamond Knockout Arbor, Metal Cut-Off Blade for Circular Saws, 1-Piece Designed to cut steel, angle iron, sheet metal and other ferrous metal products, Swift Cut (Registered Trademark) Resin bonded Aluminum-Oxide 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: 3/32-inch, Arbor: 5/8-inch Diamond Knockout, Max RPM: 9,400