The HSS counterbore drill operates continuously without chatter and leaves no burrs. The counterbore prevents the drill from clogging with chips and is optimized for chip removal and clean sinking. The drill is made from alloyed HSS steel with a 5% cobalt content for the best surface quality. This product is suitable for countersinking screws and deburring holes in metal. It is used for non-ferrous metals, alloyed and unalloyed steel, cast iron, and stainless steel. The drill has a countersink angle of 90 degrees and performs best at low speeds.