LENOX Tools 1991604 T-Shank thin metal cutting jig saw blade, 5 1/4-inch x 3/8-inch24 TPI, 3-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.