The Starrett 2" Scroll-Cutting Dual Cutting Jig Saw Blades 2UN. Starrett Unified Shank jig saws incorporate the Starrett exclusive bi-metal unique process technology. Conventional bi-metal blades use either electron beam or laser to weld the high-speed wire to the alloy backing material. Starrett innovation has developed a state-of-the-art process that resulted in a new generation of better performing band saw blades. This Starrett exclusive technology joins two strips of high-speed steel wires to the backing steel using a Solid-State Diffusion Bonding. This exciting new process creates a stronger, longer lasting blade. The L.S. Starrett Company, founded in 1880, manufactures more than 5,000 variations of Precision Tools, Gages, Measuring Instruments and Saw Blades for industrial, professional and consumer markets worldwide. Starrett tools are made to the highest standard of quality and workmanship. They want every tool in the hands of the customers to be reliable, durable and satisfactory.