The Irwin Marathon vinyl siding blade is the first designed for circular saws, according to the manufacturer. Its symmetrical, 60-degree tooth design eliminates chipping and cracking and provides a smooth finish when pushing or pulling through the cut. The 7-1/4-inch, 120-tooth blade is heat-treated to resist warping and wear. It can also cut all types of thin-wall plastic building materials, including lattice, fencing, gutters, and PVC pipe. Price: $9. 704-987-4827.