Heavy duty construction made to Type J aircraft specifications. Used for drilling holes in hard, tough materials such as stainless steel, titanium high temperature and high strength alloys. High red hardness of cobalt permits speeds 30% greater than HSS drills.

Packaging 3/64 thru 19/64 and A thru L - 12 per pack.

5/16 thru 1/2 and M thru Z - 6 per pack.