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About product and suppliers:
        Alibaba.com offers 1,358 square hole drill bit products. About 63% of these are drill bit, 8% are mining machinery parts, and 2% are milling cutter. 

A wide variety of square hole drill bit options are available to you, such as tungsten carbide, high speed steel, and high carbon steel. You can also choose from twist drill bit, center drill bit, and core drill bit. As well as from metal drilling, woodworking, and wood drilling. And whether square hole drill bit is free samples, or paid samples. 

There are 1,365 square hole drill bit suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Japan, and Taiwan, which supply 96%, 2%, and 1% of square hole drill bit respectively. 

Square hole drill bit products are most popular in Domestic Market, Eastern Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 288 with ISO9001, 176 with Other, and 33 with ISO14001 certification.