Power Tool and Attachments - Starrett Wiggler or Center Finder withed Shank attachment can adapt to countless applications and are readily interchangeable. It is an essential tool for any machine shop. Concentricity Made Easy - The spring tension on the ball of the permits the guiding to concentricity. Work can be brought into perfect alignment with the machine spindle. Built to Last - Able to withstand even the harshest environments as our wigglers or center finders are designed to last a lifetime. They are very reliable and perfect for any project you take on. The Perfect Accessory - Used in a wide variety of industries as an essential part of metalworking and woodworking, Starrett tools can be used in various applications and offers unparalleled service with execution like no other. The Standard for Excellence - Proudly made in the USA, Starrett combines over 140 years of American heritage and innovation with globally sourced materials to deliver exceptional quality tools and products. The Starrett Wiggler/Center Finder withed Shank and other attachments can adapt to countless applications and are readily interchangeable. Working centers can be quickly and accurately located. Spring tension on the ball of the permits guiding to concentricity. Work can be brought into perfect alignment with the machine spindle. Edge & Center Finders are used in the traditional method of locating a spindle relative to a work piece. Spindle location is required in order to correctly make part features. These features, like bolt hole locations for example, are often established relative to the edge a work piece. Once the edges of a part are established in the spindle, the location of the spindle can then be utilized. These tools validate when a spindle is precisely over the edge of a part. Starrett Precision Hand Tools have been the standard for high quality dimensional measuring tools since 1880. It manufactures more than 5,000 variations of Precision Tools, Gages, Measuring Instruments and Saw Blades for industrial, professional and consumer markets worldwide.