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. Set supplied in the wood stand. Picture Shows a 10 Pc. Set
