Every other tooth is ground thinner for faster cuts. Face-ground, construction-grade carbide teeth deliver fast, clean cuts and long tool life. Reinforced shoulder provides added durability. Heat vent and expansion slot design reduces vibration for longer blade life and straighter cuts. 24 tooth count blades are ideally suited for framing, ripping and deck jobs. IRWIN Tools Marathon Carbide Cordless Circular Saw Blade, 7 1/4-inch, 24T, 2-Pack (1873887).