IVY Classic 41306 Swift Cut 9-Inch x 1/8-Inch x 5/8-Inch - 11 Threaded Arbor, Masonry Depressed Center Wheel With Hub for Grinders, 1-Piece Designed for consistent, all purpose cutting of brick, concrete block, slate, tile and other masonry products, Swift Cut (Registered Trademark) Resin bonded Silicon-Carbide grain for faster cutting, Type 27 blade - for cutting only Blade double reinforced with fiberglass mesh for durability and safety Arbor reinforced with metal for extra strength Diameter: 9-inch, Width: 1/8-inch, Arbor: 5/8-inch - 11 thread, Max RPM: 6,600