Starrett Bi Metal Unique Saw Technology, with Unified Shank Jig Saw Blades will fit in virtually all jig saw machines. Our Unique Blades feature 170% more weld contact area than standard bi metal blades through the Unique solid state diffusion bonding process. This ensures exceptionally strong teeth, combined with the Multiple Cutting Edges and Split Chip Advantage, ensure that Starrett Jig Saw Blades typically last 25% longer than directly competing products.