Nylon insert locknuts are hex nuts with a nylon-filled collar

1/4-20 x 4 Combo Flat Sleeve Anchor Zinc Plated (50)

3/4-10 x 10 A307 Grade A Carriage Bolt Zinc Plated

1/2-13 x 10 Grade 5 Hex Cap Screw Zinc Plated

1-8 x 4 1/2 Grade 5 Hex Cap Screw Zinc Plated

9/32 Cobalt Heavy Duty Jobber Drill Bit (12) 1-8 Grade 8 Hex Cap Screws Yellow Zinc Plated Nylon insert locknuts are hex9 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.