The Starrett Tubular Inside Micrometer Set has rigid and lightweight rods, quick reading figures and lock nut. Extension rods are made of steel tubing and each rod is marked with length. It comes with hardened and ground anvils. It has an excellent service life and outstanding work performance. It is equipped with easily interchangeable anvils for diversified gaging, providing the full range in steps with a micrometer. 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.