1 1/4-12 Slotted Hex Nut Zinc Plated

the hardness rating is HRC 24-35

43/64 x 6 Reduced Shank Drill Bit (1/2 Shank)

1/4 x 2 Flat Split Drive Anchor Zinc Plated (100)

1 1/2-12 Grade 2 Finished Hex Nut Zinc Plated

1/16 Cobalt Heavy Duty Jobber Drill Bit (12) Flat Washers Silicon Bronze 1 1/4-12 Slotted Hex Nut1 16 Cobalt Heavy Duty Jobber Drill Bit . 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 standard heavy duty split point (HSS) drills.