You are Buying a brand New And Factory Sealed DIABLO 12 in. 6/9 TPI Demo Demon Carbide Reciprocating Saw Blades for General Purpose Cutting (3-Pack). 50X cutting life in wood and metal applications Variable tooth technology provides faster cuts with less vibration Unique plunge tip design that enables faster and easier plunging in wood PERMA-SHIELD non-stick coated for less gumming and friction 1 in. demolition body for straighter cuts with less vibration blades include exclusive features that deliver unmatched 50 times longer life in both wood and metal cutting applications. With an oversized blade body, variable tooth design, and PERMA-SHIELD non-stick coating, this blade is ideal for cutting nail-embedded wood and ferrous metal.