IRWIN Tools MARATHON Carbide Cordless Circular Saw Blade, 6 1/2-Inch, 18T (14020) 6-1/2" 18 Tooth Marathon Carbide Blade This product is highly durable This product is manufactured in China Ultra-thin kerf delivers more cuts per charge and extends cordless tool battery life. Face-ground, construction-grade carbide teeth for fast, clean cuts and long tool life. Aggressive hook angle for fast cuts. 18 tooth count blades are best for use with medium-thickness metals.