This Standard covers specifications for gage blocks up to and including 20in. and 500mm in length, including physical properties, general dimensions, tolerance grades, flatness, parallelism, surface texture requirements, and definitions of length. It is not the intent of this Standard to preclude the use of other styles (shapes), classes, and types (material) of gage blocks provided they are properly correlated by the manufacturer and user to this Standard and yield comparable results with respect to conformance within specified limits.