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About product and suppliers:
        Alibaba.com offers 1,709 screws uni products. About 11% of these are screws. 

A wide variety of screws uni options are available to you, such as steel, stainless steel. You can also choose from free samples. 

There are 1,709 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 1,317 with ISO9001, 31 with ISO14001, and 23 with Other certification.