7″, Dry Cut Diamond Wheel, 5/8″ Diamond Knock Out Arbor, For Cutting Brick, Block & Tile, Fast Shallow Cutting, Matrix Design Minimizes Chipping, Steel Body Delivers Constant Depth Of Cut & Advanced Diamond Matrix For Longer Life & Enhanced Material Removal, Lasts Up To 100 Times Longer Than Abrasive Blades, Used On 7″ & 7-1/4″ Circular, Worm Drive Saws, Carded.