Diablo, Steel Demon, 3 Pack, 4'', 8 TPI Carbide Reciprocating Blade, Designed For Extreme Metal Cutting Including High Strength Alloys, Cast Iron & Stainless Steel, Delivers Unmatched 50 Times Longer Cutting Life Than Standard Bi-Metal Blades In Extreme Thick Metal Cutting Applications Between 3/16" To 1/2", The Increased Blade Body Height Produces Straighter Cuts With Less Vibration.