Irwin 4935555 7-1/4" x 48-Tooth Metal Cutting Circular Saw Blade for Ferrous Steel 7-1/4" Diameter x 48-Tooth Metal Cutting Blade with 5/8" Arbor 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 stabilize the blade and keeps it cool for smooth & accurate cuts Anti Kick Back Shoulder reduces dust & sparks for safer cuts