Norseman by Viking Drill and Tools (6 pack) 5/16" HSS 135 Degree Split Point Black Oxide Finish Jobber Drill - Type 190. Heavy-duty construction for drilling in tougher materials. Manufactured from premium high-speed steel. 135 degree split point is self-centering for reduce thrust and easier penetration. Manufactured to NAS 907B aerospace specification. (04650)