Specification: metal materials refer to different sizes of the same type or the same model of metal materials. Generally, the allowable deviation is different for different sizes. In product standards, the specifications of varieties are usually arranged in order from small to large.
definition:
1. Standardization and pattern;
2. The quality standards specified for finished products or raw materials used;
3. Refers to the physical shape of general industrial products, generally including volume, length, shape, weight, etc;
4. It refers to the size of the lens in the animation lens splitter, which is indicated by the specification number.