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Dry Use Diamond Core Drill Bit 1-1/4-7 Unc Thread 450mm Length Crown Turbo Segments Diameter 25mm-152mm, Find Details and Price about Diamond Core Drill Bit Core Drill Bit from Dry Use Diamond Core Drill Bit 1-1/4-7 Unc Thread 450mm Length Crown Turbo Segments Diameter 25mm-152mm - Shijiazhuang Tianfu Tool Co., Ltd.