METAL RECIP SWBLD 9"8TPI The Diablo Steel Demon Carbide-tipped reciprocating blades are the first carbide-tipped blades designed for extreme metal cutting; including high strength alloys, cast iron and stainless steel. This high performance carbide-tipped blade delivers unmatched 50 times longer cutting life than standard bi-metal blades in extreme thick metal cutting applications between 3/16 € to 9/16 €.