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 bimetal 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