Diablo's bi-metal teeth jig saw blades are specifically designed for maximum durability and longer life in wood, metal and plastic applications. These high-performance blades feature an ultra-hardened cutting edge to deliver up to 5X longer life than standard blades. The optimized blade design and Perma-SHIELD non-stick coating reduces heat and pitch build up for effortless, clean cuts. T-shank design fits all combo and most U-shank cordless and corded jig saws.