When selecting iron net, you must prioritize wire diameter (gauge), mesh size (aperture), and material grade. For heavy-duty applications, ensure the wire diameter is consistent across the roll to prevent structural weak points. Common materials include low-carbon steel, galvanized iron, and stainless steel (304/316). For outdoor or high-moisture environments, Hot-Dipped Galvanized (HDG) coating is essential, as it provides a thicker protective layer (measured in g/m²) compared to electro-galvanized alternatives, significantly extending the product's lifespan against corrosion.