Diablo's Demo Demon Starlock bi-metal oscillating blades feature application specific designs that deliver maximum durability and longer life in nail-embedded wood applications. Curve contact edge creates a pilot for precise, clean plunge cuts with less vibration. Black I.C.E. (Industrial Cooling Element) protects the cutting edge against wear, delivering extreme durability and fast, clean cuts. Tool free quick-change interface fits Fein and other Starlock tools, also compatible with most non-Starlock multi-tools.