LENOX Tools Circular Saw Blade, Steel-Cutting, 6 3/4-inch, 40T (21878ST634040CT)
6-3/4" x 40, Lenox Steel Metal Circular Saw Blade, Faster Way To Cut Metal, Extended Life, Titanium Carbide Tipped Resists Material Build Up On Teeth, Clean, Cool, Cuts, Less Burr Than Abrasive Blades, No Need For Secondary Grinding, While Reducing Material Burning, Modified Triple Chip Grind For Added Durability, Resharpenable.
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These cut exactly like the OEM Milwaukee blades but last about twice as long. Truth be told, the Diablo cuts nicer than either (for a minute) but it has such poor blade life it's basically unusable. These blades are absolutely the best combination on the market of cut quality and blade life.
Not a big surprise considering I've been using Lenox blades in my recip saw for a lot longer and those outperform everything else I've tried as well. In my opinion, cutting metal for a living 7 days a week, don't waste your time trying every other blade out there - I already did it. Lenox are priced a little higher than the competition but they more than make up for that difference with blade life. As far as I can tell Lenox makes the best metal cutting blades on the planet bar none.
We were also disappointed in Lenox's 14" metal cutting blade which lasted a day or two. Again, we had better luck with the DeWalt 14" 66 tooth for 12 GA steel studs.