3-1/4In 18TPI BIM T-Shk JSB, PK5, Primary Saw Application Specialty, Package Quantity 5 BOSCH Stainless Steel Jig Saw Blades Deliver 2X Longer Life Specialty jobs call for specialty tools and accessories and BOSCH, the world's leading manufacturer of jigsaw blades, has introduced its stainless steel blades. Until now, most users have used a standard bi-metal blade in stainless steel that quickly dulls and produces a less than desired cut. BOSCH's new blades are bi-metal with an eight percent cobalt steel additive which increases heat and wear resistance. This gives users a blade that lasts twice as long as a bi-metal blade and costs much less than blades with a carbide stip. The Stainless Steel Blades are suited for cutting thin and medium gauge steels.