IRWIN Tools MARATHON Vinyl Siding Corded Circular Saw Blade, 7 1/4-inch, 120T (11830) Circular saw blades are made with an optimized, symmetric, 60-angle tooth design Innovative heat vent and expansion slot designs Fully heat-treated circular saw blade Circular saw blades cut gutters, vinyl siding and PVC piping 120 tooth count Optimized, Symmetric 60-Degree Tooth Design Innovative Heat Vent Expansion Slot Designs Fully Heat Treated Cuts Gutters, Vinyl Siding and PVC Piping First vinyl siding circular saw blade