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About product and suppliers:
        Alibaba.com offers 39,129 knob screw products. About 10% of these are bottles, 3% are screws. 

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

There are 39,129 knob screw suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of knob screw respectively. 

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

You can ensure product safety by selecting from certified suppliers, including 7,648 with ISO9001, 6,427 with Other, and 1,396 with ISO14001 certification.