When one end dulls, turn the countersink around for a sharp edge. For use with hard-to-machine materials, these countersinks are cobalt steel for better heat and abrasion resistance than high-speed steel countersinks. The 60° countersink angle is compatible with the profile of centers on a lathe. They have a small drill point on the tip for drilling and countersinking holes with the same tool. The drill point creates a small gap that prevents damage to the points of live or dead centers.

For technical drawings and 3-D models, click on a part number.