Diablo's Bi-Metal teeth jig saw blades are specifically designed for maximum durability, cut quality and longer life in ultra fine finish wood 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 provides precise cuts in straight, angled and intricate curved cutting applications. A Bi-Directional tooth design features teeth facing in opposite directions at each end of the blade to deliver ultra fine finishes on the top and bottom of the wood. T-shank design fits all combo and most U-shank cordless and corded jig saws