IRWIN Tools Corded Steel Circular Saw Blade, 7 1/4-inch, 40T (11140) Precision-ground teeth allow for smooth, accurate cuts. Fully hardened plate runs truer longer. Corrosion-resistant coating helps prevent rusting. Heavy-gauge high-carbon steel for extended life. Features a 5/8-Inch Universal Arbor. 40 tooth count blades are ideally suited for trim and finish jobs.