Description .020″ 10 TPI Portable Band Saw Blade – 3 PACK 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. Features: 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