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About product and suppliers:
        Alibaba.com offers 313 square deadbolt products. About 89% of these are locks. 

A wide variety of square deadbolt options are available to you, such as entry doors, door & window handles. You can also choose from swing, sliding. As well as from free samples. 

There are 313 square deadbolt suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of square deadbolt respectively. 

Square deadbolt products are most popular in South America, Mid East, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 29 with ISO9001, 21 with Other, and 1 with ISO14001 certification.