Diablo’s Starlock fit bi-metal oscillating blades feature application specific designs that deliver maximum durability and longer life in metal. These high-performance blades feature an ultra-hardened cutting edge to deliver up to 5X longer life than standard blades. An optimized tooth design reduces vibration for fast and clean cuts. Black I.C.E. (Industrial Cooling Element) keeps the teeth cool and build up free for fast, clean cuts. Tool free quick-change interface fits Fein and other Starlock tools; also compatible with most non-Starlock multi-tools.