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Co-Bore Cobalt Boring Bars


Made in USA by APT.  Made of premium cobalt high speed steel in a one piece construction, these boring bars may also be modified to a special grooving tool to produce various internal shapes and radii.  Cobalt is an ideal tool material because of its high red hardness, abrasive resistance and ability to maintain a sharp edge.  In addition, cobalt is used successfully to significantly extend tool life.

3/8" Shank
1/2" Shank
5/8" Shank
3/4" Shank
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