Diablo’s Starlock bi-metal oscillating blades feature application specific designs that deliver maximum durability and longer life when cutting insulation. These high-performance blades feature an ultra-hardened cutting edge to deliver up to 5X longer life than standard blades. The serrated blade provides faster, cleaner cuts in insulation. Curve contact edge creates a pilot for precise, clean plunge cuts with less vibration. Tool free quick-change interface fits Fein and other Starlock tools; also compatible with most non-Starlock multi-tools.