IRWIN® has redefined excellence in the world of saw blades with the introduction of MARATHON® with WeldTec™. This revolutionary new saw blade has WELDED carbide teeth for a 30% stronger tooth bond that gives you 50% longer life. UC2™ (sub-micro grain) carbide teeth are 70% more compact than standard carbide teeth and are sharpened to finer, more durable cutting edges that stay sharper longer. The E.O.T.™ grind technology, where every other tooth is ground thinner, makes this the FASTEST FRAMING BLADE EVER™.