Overview Reviews Product Description Irwin marathon circular saw blades last longer by design.New heat/vent expansion slots reduce vibration, providing longer life for the blade and straighter cuts for the user.A reinforced shoulder adds durability, and alternating carbide teeth are ground thinner to stay sharp longer and offer faster cutting. Irwin Tools Catalog Product Videos Custom Field Manufacturing country VN Product Reviews Write a Review Write a Review × Irwin 10 Pc. 6-1/2" 20T Marathon® Circular Saw Blade 24021 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *