New and improved design
Every other tooth is thinner for faster cuts
New heat vent/expansion slot design reduces vibration for longer life and straighter cuts
Construction grade carbide teeth for longer life
Reinforced shoulder for added durability
Fully hardened plate runs longer.
![Irwin®Marathon® Portable Corded Circular Saw Blades, 7 1/4", 18 Teeth, Bulk #IR-24028 (10/Pkg) Irwin®Marathon® Portable Corded Circular Saw Blades, 7 1/4", 18 Teeth, Bulk #IR-24028 (10/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/258408/363312/585-24028__47383.1595392919.jpg?c=2)