so they fill old worn spike holes tightly

3/4-10 x 4 1/4 Simpson Wedge Anchor 304 SS (10)

1-14 x 6 Grade 8 Hex Cap Screw Yellow Zinc Plated

1/4-20 Drop-In Anchor Zinc Plated (100)

19/32 x 6 Reduced Shank Drill Bit (1/2 Shank)

1/8 Cobalt Heavy Duty Jobber Drill Bit (12) Drop-In Anchors 303 Stainless Steel so they fill old worn1 8 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.