Irwin Marathon Circular Saw Blade Thinner kerf provides faster, cleaner, more exacting cuts. C3 carbide tipped teeth are precision honed and impact-resistant to hold their edge longer. Unique shoulder design puts more support behind each tooth for smoother, more exact cuts. Specially engineered heat vents eliminate blade warping. All except 3-3/8 , 5-3/8 , 5-1/2 , 6-1/2 , 9 and larger have diamond knockout. Thinner kerf provides faster, cleaner, more exacting cuts. C3 carbide tipped teeth are precision honed and impact-resistant to hold their edge longer. Unique shoulder design puts more support behind each tooth for smoother, more exact cuts. Specially engineered heat vents eliminate blade warping. All except 3-3/8 , 5-3/8 , 5-1/2 , 6-1/2 , 9 and larger have diamond knockout. WARNING Cancer and Reproductive Harm www.P65Warnings.ca.gov