The Irwin Construction Table & Mitre Circular Saw Blade with welded carbide teeth for a stronger tooth bond and longer life. The ultra compact carbide is up to 70% tougher than standard carbide for superior sharpness and cut quality. The blades have innovative heat vents and a fully hardened plate that runs truer for longer and with more accuracy. They have an alternate top bevel (ATB) tooth grind for cross-cutting and ripping in all woods.