1. Cracking: cracks or small cracks in bicycle accessories caused by machining damage;
2. Soft scratch: no obvious deep scratch, no hand feeling, but it can be clearly seen by the naked eye;
3. Welding scar: the raised scar left by bicycle accessories after welding without grinding and planing;
4. Hard scratch: there are obvious deep scratches on the surface of bicycle accessories caused by hard object friction;
5. Deformation: plane deformation of bicycle accessories caused by improper adjustment of processing equipment or internal stress of materials;
6. Dimensional deviation: the dimensional deviation of bicycle accessories exceeds the design allowable level due to the insufficient accuracy of processing equipment;
7. Uneven cutting: the edge cutting is uneven due to improper positioning or equipment fixation of bicycle accessories during processing;
8. Surface dents: dents formed on the metal surface caused by internal impurities due to poor heat treatment of materials or rust of materials;
9. Scratches: scratches and cuts on the surface of bicycle accessories caused by improper protection during processing, packaging and transportation;
10. Oxidation and rust: rust spots appear on the surface of bicycle accessories due to the lack of corresponding rust prevention treatment or improper treatment measures after processing;
11. Burr: the metal burr on the edge or parting surface of the machined part due to the failure to deal with the bicycle parts after mechanical stamping or cutting.