This packaging is usually used for, the stainless steel pipes&tubes with samll outer diameter and thin wall thickness. At most times, within the plywood case, it is lined with waterproof cloth or paper. If required, drier is also available in some cases. In this way, the pipes&tubes can be kept in a dry environment. After products been loaded into the plywood case, many steel rods were tightened across the case and as the corner. The plywood case would be hardened in this way.
Advantages: Cheaper than wooden case, lighter and environment friendly