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Crown Teeth Dia Diamond Core Drill Bit 1-1/4-7 Unc Thread 450mm Length 18mm-400mm, Find Details and Price about Diamond Drill Bit Dry Diamond Core Bit from Crown Teeth Dia Diamond Core Drill Bit 1-1/4-7 Unc Thread 450mm Length 18mm-400mm - Hebei Golden Finger Tools Co., Ltd.