... use cnc grooving turning tools Specifications: Insert type:CN--1204--Screw:VHX0821Wrench:L3.0Level:LV4 Festure: 1.firm clamping2.high ... cutting.4.When installed ,you need to tighten the holder screw,and generally ,you need to tighten the two screws.when tighting ... in producing top circle turning tool, inner hole turning tools, screw turning tools, small cutter holder, grooving tools, knife folders, ...