The DEWALT® 18 TPI portable band saw blade (3 pack) is built to last, with a number of exclusive technologies designed to give you confidence that the blade will resist wear throughout its lifespan. An 8% cobalt content and RC 65-67 tooth hardness maximize durability. With an alloy steel backer and matrix II high speed steel edge, users never need to worry about heat and fatigue. DEWALT® understands that you can't afford to invest in an inferior product. All DEWALT® products are extensively tested to ensure that they won't let you down on your real world jobsites.