The steel-frame plywood formwork is made by good hot rolled section steel, 1/2-inch HDO plywood . HIZEN steel-frame plywood formwork is made by good hot rolled section steel, 1/2-inch HDO plywood . This concrete forming system has the same size and dimension to the Symons or Ellis . We are exporting to USA, Middle America and South America. We insure the stable quality. CONCRETE FORMWORK SYSTEM ( ...