This carbide tipped 9-piece boring bar set includes three different length boring bars each for minimum bores of 5/16″, 7/16″, and 9/16″. The bore depth ranges from 3/4″ to 3″.
The heat treated, alloy steel shanks are held to 0.000 to -0.0005″ from the nominal diameter.
The boring bar holder fits in the standard 4-way tool post on 7×10, 7×12, and 7×14 mini lathes. It holds boring bars with 1/2″ shanks.
The stand may vary from that shown in the photo.

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