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The Starrett 828A wriggler center finder with pointed shank and swiveling ball joint aligns a workpiece with the center of the machine spindle to ensure accurate machining of the true center of the workpiece. The spring-tension ball joint enables the user to guide the point to the working center. The center has a pointed shank and 3/8" (9.5mm) ball diameter spindle. The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.