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the core drill bit is also called a hollow drill bit, a magnetic drill bit, a magnetic drill bit, an opener, a drill bit classification high-speed rail drill bit, a hard alloy drill bit, a tungsten steel bore cutting high-level degree of 35 mm 50 mm or 100 mm specifications 12 mm to 100. the core of the core drill bit is 1855 ~ 1863m, the core is 84 ~ 164m, the core drilling speed is 0 99 ~ 2 89mh, the core yield is 89% ~ 96% new core drill bit @ 冯耀忠 this article total 1 page continues to read this article.
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