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75mm 91mm 94mm 112mm 132mm 151mm 171mm Non Core Diamond Bit with Roller, Find Details and Price about Nq Hq Diamond Core Drill Bit Nq-Hq-Nx-Diamond-Core-Bit from 75mm 91mm 94mm 112mm 132mm 151mm 171mm Non Core Diamond Bit with Roller - Hunan Hippo Drilling Tool Co., Ltd.