Diablo's Demo Demon Starlock bi-metal oscillating blades feature application specific designs that deliver maximum durability and longer life in clean wood applications. Curve contact edge creates a pilot for precise, clean plunge cuts with less vibration. An optimized Japanese tooth design and 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.