Diablo's bi-metal teeth jig saw blades are specifically designed for maximum durability, longer life and speed in thick metal applications ranging from 1/8” to 1/4” thickness. These high-performance blades feature an ultra-hardened cutting edge to deliver up to 5X longer life than standard blades. A back taper blade design and Perma-SHIELD non-stick coating reduces heat and pitch build up for fast and clean cuts in metal. T-shank design fits all combo and most U-shank cordless and corded jig saws.