Steel Concrete Cylinder Molds are heavy-duty and reusable many times over. Walls are 1/4in (6.4mm) thick and split longitudinally to allow easy specimen removal. When clamps are released, the mold springs apart slightly. Detachable base plate is tight-fitting. All parts are plated for rust resistance and are non-reactive to cement constituents. Steel molds give uniform results and are dimensionally stable under severe use. Meets Standards AASHTO R 39 , AASHTO T 23 , ASTM C192 , ASTM C31 , ASTM C470 , AASHTO M 205M/M 205