IRWIN Tools Metal-Cutting Circular Saw Blade, 7 1/4-inch, 48T (4935555) Laser-cut saw blades and anti-vibration vents keep the blade cool for smooth and accurate cuts Metal cutting-grade carbide saw blade teeth withstand impact, reduce wear and deliver longer life Anti-kickback tooth shoulder Circular saw blade is designed for cutting ferrous steel or thin steel 48 teeth Metal Cutting Grade Carbide Tooth reduces wear, withstands impact & delivers longer life Laser Cut Blade provides for stronger tooth bond Laser Cut Anti-Vibration Vents that stabilizes the blade and keeps it cool for smooth & accurate cuts Anti Kick Back Shoulder reduces dust & sparks for safer cuts