Steel Concrete Cylinder Molds are heavy-duty and reusable many times over. 1/4in (6.4mm) thick walls are 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. HM-144 6x12in Mold has a built-in handle for easier handling of specimens. Available in 6x12in (152x305mm) or 4x8in (102x203mm) sizes.