In product design,wholesale zippers with tooth chain with very sophisticated, we need to pull head or tooth chain of manufacturing error control in some range, the manufacture precision and manufacture of mechanical watches par (are gear, chain of zipper teeth was quite with the rack and pinion).slider compared with tooth chain, pull head, whether from the shape or size are relatively fixed, the characteristics of metal solid material), after the mould making out, head of basic size is not going to happen great changes (except external gave very unreasonable force), is not easy to deformation, stability; At the same time, the manufacturing accuracy of the puller is relatively easy to control, as long as the raw materials are reasonable, the mould manufacturing precision is high, the work performance is good, the quality is more stable.