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About product and suppliers:
        Alibaba.com offers 2,066 knurling m4 products. About 36% of these are nuts, 3% are machining. 

A wide variety of knurling m4 options are available to you, such as stainless steel, steel, and plastic. You can also choose from free samples, paid samples. 

There are 2,069 knurling m4 suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and India, which supply 97%, 1%, and 1% of knurling m4 respectively. 

Knurling m4 products are most popular in North America, Domestic Market, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 1,115 with ISO9001, 357 with ISO14001, and 110 with Other certification.