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About product and suppliers:
        Alibaba.com offers 369 parallel ruler products. About 81% of these are rulers, 1% are math sets, and 1% are compasses. 

A wide variety of parallel ruler options are available to you, such as plastic, wood, and metal. You can also choose from no, yes. As well as from free samples. 

There are 369 parallel ruler suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of parallel ruler respectively. 

Parallel ruler products are most popular in Western Europe, South America, and Eastern Asia. 

You can ensure product safety by selecting from certified suppliers, including 347 with Other, 199 with ISO9001, and 7 with ISO14001 certification.