7", High Performance Masonry Blade, 5/8" Diamond Knock Out Arbor, For Cutting Brick & Masonry Material, Faster Cut Rate At Constant Depth & Minimizes Dust With Thinner Kerf, Lasts Up To 30 Times Longer Than Abrasive Blades, Use On 7" & 7-1/4" Circular Saws, Bulk.