A revolutionary new design concept makes this one of the most efficient, longest-lasting blades in the industry. 90% of the carbide tip cuts, where most other blades only utilize about 60% of the carbide tip. The 12" Quad Blade will give a longer blade life than single carbide blades by 2-4 times. Fit all makes and models of power roof saws. Cutting depth of 2-1/4". Roofmaster offers an exclusive limited warranty on the bonding of our carbide inserts to the steel blade. This model features 1/4" carbide.