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About product and suppliers:
        Alibaba.com offers 2,676 knurling m4 products. About 2% of these are machining, 1% are furniture handles & knobs. 

A wide variety of knurling m4 options are available to you, such as free samples, paid samples. 

There are 2,690 knurling m4 suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and India, which supply 98%, 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 1,680 with ISO9001, 399 with ISO14001, and 115 with Other certification.