Lenox Gold Power Arc Curved blades last twice as long as standard straight Lenox reciprocating blades. The curved design optimizes the cutting angle, allowing the blade to cut aggressively and more efficiently versus a straight blade. Shatter-resistant, bimetal blades have a titanium-coated edge which improves wear resistance of teeth. Cuts soil pipe, cast iron, plywood, ceramic wall tile, brick, carbon, fiberglass, plaster, cement, laminates, marble, and hardwood floor. Packed 5 blades per pack.