QC21P HSS BRT QC 135D JL Drill N25 N25, 12PK Manufactured from premium High Speed Steel for drilling aluminum, steel, stainless steel and many other materials, QC21P jobber drills have a 135 degree split point to help with self-centering and reduce the push force needed, and a special parabolic flute, designed to make it possible to drill deeper holes in a single pass.