Internal Threading Boring Bar Left Hand Holder 29°4ACME Turning Insert 5PCS For 29 degree trapezoidal 4ACME nut turning tool. Lathe 4ACME internal thread boring bar turning tool. Tool holder made of spring steel, heat treated and machined. Inserts are made of high end German carbide. Five-axis tool grinding and processing thread angle with high precision and sharp cutting edge The surface has a special German coating to improve the life of the insert, high temperature resistance, not easy to wear, can be processed steel, for carbon steel, stainless steel, cast iron, heat treatment steel processing Items include SVNL0020R22 1PCS 22VNR4ACME 5PCS.
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