Category: Furniture & Building Materials Date: Do the processes and classifications make you confused? Are these screws self - tapping screws, square - headed screws, or other types? Facing these non - standard fasteners, many people often dont know how to declare correctly. This article will introduce in detail the export process, classification requirements and relevant information on standardized declaration of steel - made fasteners, helping you better understand and master the export customs declaration requirements for fasteners. Source: Import and Export Agency of Zhongshen International Trade