LENOX Tools 1991605 T-Shank thin metal cutting jig saw blade, 5 1/4-inch x 3/8-inch24 TPI, 5-Pack provides users with improved blade durability and long life in thin metal. Power blast technology strengthens the blade to reduce breaks and increase durability. Patented T2 technology provides fast, efficient cutting in a range of metal cutting applications. Bi-metal technology flexes to resist breaking and extend blade life.