Concrete Cylinder Molds are compliant with ASTM C31, ASTM C192, and ASTM C470 standards, as well as AASHTO M 205/205M, AASHTO R 39 and AASHTO T 23 standards. Steel Concrete Test Cylinder Molds are constructed from steel and are designed for rigorous laboratory use. With base plate, two bolt lock and longitudinal opening, the molds allow for convenient sample removal. Available with a carrying handle and in two sizes, 6"x12" (152x305mm) or 4"x8" (102x203mm).