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If you have many screws with various sizes, it can be used as interesting items. Like this miniature motorcycle, which has various models.
In repairing a motor or other mechanical device, usually time unload pairs of bolts there must be worn or damaged so as not to provide good grip. For that reason, bolts usually need a new replacement.
Used bolts that have become an interesting work of art can bring its own economic value. You can sell miniature motorcycles made from used bolts both on-line and off-line. On-line miniature as in this photo can be sold at tens of thousands or even hundreds of thousands