Supports the following standards: ASTM C186, ASTM D3282, ASTM D421, ASTM D4943, AASHTO T87 Heavy porcelain mortar, glazed outside surface and unglazed inside; for use with H-4258 pestle to break up soil particle aggregates for testing. Mortar is 3.5" (90mm) ID x 2.25" (57mm) H.