This Irwin Marathon Portable Corded Circular Saw Blade is designed so that every other tooth is thinner to produce faster cuts. The heat vent/expansion slot design and construction-grade, carbide-tipped teeth help extend the circular saw blade's life and prevent warping. The reinforced shoulder increases durability even further and the fully-hardened plate runs truer, longer. These circular saw blades are designed for cross-cutting and trimming all woods, paneling, plywood and chipboard.