Master Mechanic, 6-1/2″ x 1/8″ Arbor, Masonry Wheel, With 5/8″ Diamond Knockout, Constructed With 2 Pieces Of Extra Strength Fiberglass For Long Life, Premium Grain For Added Wheel Life & Speed Of Cut, High Quality Resin Bonds 100% Inspected Before Use For Product Consistency & Quality, Applications Include Cutting All Types Of Concrete & Masonry Products, Block, Bricks, Pavers, Concrete, Max RPM Rating 9,400.