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About product and suppliers:
        Alibaba.com offers 5,429 drill collar products. About 66% of these are mining machinery parts, 1% are pet collars & leashes, and 1% are necklaces. 

A wide variety of drill collar options are available to you, such as drill pipe, drill collar, and slip. You can also choose from carbon steel, high manganese steel, and carbide. As well as from drilling tool, drilling equipment. And whether drill collar is forging, or casting. 

There are 5,370 drill collar suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 99%, 1%, and 1% of drill collar respectively. 

Drill collar products are most popular in Mid East, Domestic Market, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 4,094 with Other, 1,678 with ISO9001, and 218 with ISO14001 certification.