The Irwin WeldTec Circular Fiber Cement Saw Blade is made stronger to last longer. This specialty application blade features patented WeldTec technology with carbide teeth that are welded not brazed so they deliver the fastest cutting speed and increased durability. A heat resistant non-stick coating reduces binding and gumming so the blade delivers cleaner truer cuts. while perimeter venting allows for faster chip ejection as well a strengthened core of the blade. These blades are laser cut and include expansion control slots for reduced warping and vibration.