This Gulf standard specifies requirements for rectangular or square granite surface plates ranging from 160 mm x 100 mm to 2 500 x 1 600 mm, as preferred sizes, in four grades of accuracy 0, 1, 2 and 3. NOTE 1 “Granite” is a commonly used description; a more specific description is given in clause 4. This Gulf standard applies to new granite surface plates, granite surface plates in use, and those reconditioned according to their grade.