Starrett bi-metal Unique™ saw technology, with Unified Shank™ jigsaw blades will fit in virtually all jigsaw machines. Starrett 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, ensuring that Starrett jigsaw blades typically last 25% longer than directly competing products.