Marathon, 6", 14 TPI, Bi-Metal Reciprocating Blades, Blades Feature 1/2" Universal Tang To Fit All Standard Saws, Spring Steel Backing Makes The Blade Virtually Unbreakable, High Speed Cutting Edge Made Of Super Hard Tool Steel RC 65-66 & An Aggressive Tooth Angle, This Blades Is Ideal For Both Metal Cutting Applications, Cuts Composition Material, Plastic, Pipe, Carbon Steel, Sheet Metal & Stainless Steel, Each Blade Is Individually UPC Coded, Contains 25 Blades.