This carbide tipped 9-piece boring bar set includes three different length boring bars each for minimum bores of 5/16″, 3/8″, and 7/16″. The bore depth ranges from 3/4″ to 2-1/4″.
The heat treated, alloy steel shanks are held to 0.000 to -0.0005″ from the nominal diameter.
The holder may vary from that shown in the photo.

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