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About product and suppliers:
        Alibaba.com offers 1,072 knobs machine screw products. About 11% of these are screws. 

A wide variety of knobs machine screw options are available to you, such as free samples, paid samples. 

There are 1,072 knobs machine screw suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of knobs machine screw respectively. 

Knobs machine screw products are most popular in North America, Domestic Market, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 340 with ISO9001, 160 with Other, and 36 with ISO14001 certification.