You are Buying a Brand New And factory Sealed DIABLO 12 in. 5/7 TPI Demo Demon Carbide Reciprocating Saw Blades for Nail-Embedded Wood Cutting Model #DS1206CWS33 Ct..This high performance carbide-tipped blades deliver an unmatched 20 times longer cutting life than bi-metal blades in nail-embedded wood. Diablos patented variable tooth technology provides faster cuts with less vibration.