Diablo, 5 pack, 4" 6 TPI bi-metal T-shank jig saw blades for fast wood cuts. Diablo's bi-metal teeth jig saw blades are specifically designed for maximum durability, longer life and speed in clean wood applications. These high-performance blades feature an ultra-hardened cutting edge to deliver up to 5 times longer life than standard blades. The optimized blade design reduces heat and pitch build up and for fast, clean cuts. T-shank design fits all combo and most U-shank cordless and corded jig saws.