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THE STARRETT GRANITE SURFACE PLATE IS A PRECISION TOOLROOM INSTRUMENT DESIGNED FOR QUALITY CONTROL APPLICATIONS, OFFERING EXCEPTIONAL WEAR RESISTANCE. IT FEATURES A GRADE B (INSPECTION GRADE) CLASSIFICATION, SUITABLE FOR GENERAL WORK IN QUALITY CONTROL ENVIRONMENTS. THE SURFACE PLATE MEASURES 24 INCHES BY 36 INCHES (600MM X 900MM) WITH A THICKNESS OF 6 INCHES (150MM). IT IS CONSTRUCTED FROM TOOLROOM-GRADE GRANITE, KNOWN FOR ITS SUPERIOR DURABILITY COMPARED TO OTHER MATERIALS. THE PLATE MAINTAINS A FLATNESS TOLERANCE OF .000200 INCHES (0.0050MM), ENSURING HIGH PRECISION IN MEASUREMENT TASKS. WEIGHING 495 POUNDS, THIS SURFACE PLATE IS PRODUCED WITHOUT LEDGES, PROVIDING A SMOOTH AND UNINTERRUPTED WORKING SURFACE. DESPITE MINOR EDGE CHIPS, IT REMAINS IDEAL FOR PRECISION WORK.