also referred to as acorn nuts are used to cover exposed bolt ends and add a finished appearance

tie-wire or slotted hex head styles

39/64 x 6 Reduced Shank Drill Bit (1/2 Shank)

1/4 x 2 1/2 Mushroom Spike Zinc Plated (100)

3/8 x 3 Titen HD Concrete Anchor Zinc Plated (50)

11/32 Cobalt Heavy Duty Jobber Drill Bit (6) Jobber Drill Bits - Cobalt also referred to as acorn11 32 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.