Milwaukee Electric Tool Corporation's Doube Duty Upgrade, an addition to their metal SAWZALL blade line, delivering over twice the life than previous Milwaukee blades. Designed not to tang and buckle under stress, the blades come both in the "THIN KERF" profile for fast, flexible cuts and a "DEMO" blade profile, known as "The Torch," for tough, straight cuts. The Torch blades feature a tooth form optimized for long life and maximum durability. TheTHIN KERF blades maintain a short profile and thin body. Both of the blade profiles feature a deep stamp design in the tang of the blade, where it connects to the tool.