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About product and suppliers:
        Alibaba.com offers 143 both head screw products. About 18% of these are screws. 

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

There are 143 both head screw suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of both head screw respectively. 

Both head screw products are most popular in North America, Domestic Market, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 34 with ISO9001, 9 with Other, and 1 with ISO14001 certification.