Made of super-strength steel, spiral portion coated with orange PTFE, T.C.T. head with precision balanced center point. 2+2 precision ground cutting edges, 2 negatively ground spurs, 2 spiral flutes, parallel shank with driving flat and length adjusting screw. Used for drilling and countersinking in solid wood, wood composites, plastic and laminated materials. Suitable for high performance speed on boring machines equipped with adaptors or chucks.