Product Description Packed with a Matrix II High-Speed Steel Edge, 8% cobalt content, and Rc 65-67 tooth hardness, DEWALT Bi-Metal Portable Bandsaw Blades can stand up to extreme heat and wear. An alloy steel backer resists fatigue. Amazon.com DeWalt .020-by-44-7/8-Inch 14 TPI Portable Band Saw Blades maximize the performance of your portable band saw. These blades are constructed with a Matrix II high speed steel edge and an alloy steel backer for heat and wear resistance. With a Rc 65-67 tooth hardness and an 8 percent cobalt content, these blades are manufactured to provide performance on the jobsite. All the blades are 44-7/8 inches long and 1/2-inch in height. From the Manufacturer DeWalt DW3982 .020-by-44-7/8-Inch 14 TPI Portable Band Saw Blade, 3-Pack