The Starrett Steel Adjustable Parallel is produced with quality materials. It provides a wide range of use in layout, gaging, inspection work and for setups on various machine tools. Their adjustable feature makes it possible to adjust them to exact size by micrometer measurement and also permits use in place of several solid-type parallels. These parallels are useful as gages in checking the size of slots and openings. They are also convenient for use in machine vises, for leveling or adjusting work on setups of milling and grinding machines, shapers, planers, drill presses and for many other applications. Parallels slide smoothly and can be easily adjusted. The smaller sizes A, B, and C, are locked by one screw while the larger sizes, D, E, and F, have two lock screws. Starrett Parallels help an end user directly measure, layout, fixture, and do other support work related to linear dimensioning to accomplish a job. It is made with the same care and accuracy as our precision rules. Incorporating convenience and excellence, Starrett tools are designed to be user-friendly. Whether youre an experienced professional or an amateur when it comes to home improvement, our tools are handy and accessible. Starrett has set the standard for precision, quality, and innovation, our products are long-lasting and robust with excellent service and performance. Manufacturing long-lasting and easy to use tools that provide consistent and reliable performance since 1880, Starrett tools are made with the highest standard of quality and workmanship, manufacturing more than 5,000 various tools, gages, and instruments, providing fine precision tools for industrial, professional, and consumer markets worldwide.