providing adequate bearing surface for nearly all applications

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

As the anchor is driven into the hole

#17 Heavy Duty Jobber Drill Bit

11/32 Cobalt Heavy Duty Jobber Drill Bit (6) Jobber Drill Bits - Cobalt providing adequate bearing surface for11 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.