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About product and suppliers:
        Alibaba.com offers 1,435 screws uni products. About 13% of these are screws. 

A wide variety of screws uni options are available to you, such as free samples. 

There are 1,435 screws uni suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of screws uni respectively. 

Screws uni products are most popular in South America, Mid East, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 1,046 with ISO9001, 34 with ISO14001, and 29 with Other certification.