Lenox Power Blast Technology provides a harder blade resulting in increased durability and longer life. The usual trade-off for this durability is a reduction in cutting speed, which can be worth it on some applications where the blades may be broken. But Lenox has found a way to increase durability while maintaining speed in the Bi-Metal Reciprocating Saw Blades. The patented T2 Technology reduces the cutting forces on each tooth allowing for efficient cutting in the widest range of materials.