DEWALT DW3985 10/14TPI Portable Band Saw Blade - 44-7/8-Inch, .020-Inch, Matrix Ll (3-Pack) Matrix II High Speed Steel Edge for Heat and Wear Resistance 8% Cobalt Content For Added Durability & Wear Rc 65-67 Tooth Hardness For Increased Wear Resistance Alloy Steel Backer for Fatigue Resistance Matrix II high speed steel edge for heat and wear resistance 8 percent cobalt content For added durability; wear Rc 65-67 tooth hardness for increased wear resistance Alloy steel backer for fatigue resistance