2PCS 5/8" MGIVR2016-2 MGIVL2016-2 Lathe Boring Bar Grooving Cut-Off Tool Holder with 2PCS MGMN200-G NC3020 Insert. Grooving holder : Each tool holder is black oxidized smooth surface and tool hardness (HRC 48 degrees up and down) and precision are up to the first grade.
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