4-1/2" High Performance Masonry Blade, Advanced Diamond Matrix Provides Long Life & Enhanced Material Removal, Thinner Kerf To Increase Speed Of Cut While Minimizing Dust, Achieves 30 Times Longer Life Than Bonded Abrasives, Best For Cutting Block, Masonry Siding Products, & Other Masonry Materials, Faster Cut Rate At A Constant Depth, Ideally Used On Thinner & Softer Masonry Materials.