... apply through,coolant system The useage: The tool is composed by two parts: holder and insert, holder is for clamping, and the insert ... the cutting.4.When installed ,you need to tighten the holder screw,and generally ,you need to tighten the two ... specialize in producing top circle turning tool, inner hole turning tools, screw turning tools, small cutter holder, grooving tools, knife folders, boring ...