4" 14 TPI, Reciprocating Saw Blade, Reinforced Teeth Design Provides Increased Durability, High Grade Bi-Metal Material Provides Flexibility To Minimize Breakage, High Speed Steel Provides Maximum Durability On Cutting Edge, Specially Formulated Anti-Stick Coating Minimizes Friction, Used For A Wide Variety Of Applications From Thick Metal Cutting, Black Iron Pipe, To Thin Metal Cutting, Sheet Metal, Bulk.