Suitable for medium alloyed materials and stainless steel

consistent embedment and uniform rod lengths

When a screw reaches the collar

pre-expanded anchor

1-14 x 3 Grade 8 Hex Cap Screw Yellow Zinc Plated

13/32 Cobalt Heavy Duty Jobber Drill Bit (6) 1/2 Hex Lag Screws Zinc Plated Suitable for medium alloyed materials13 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.