The nylon flange head adds stability in hollow surfaces

1/4-20 x 2 Combo Flat Sleeve Anchor Zinc Plated (100)

4-4 A194 2H Heavy Hex Nut Plain

With this specific product

(A5™) 3/16 ALLIGATOR® Flush Mount Anchor Nylon (200)

5/16 Heavy Duty Jobber Drill Bit (6) 7/8-14 Grade 8 Hex Cap Screws Yellow Zinc Plated The nylon flange head adds5 16 Heavy Duty Jobber Drill Bit . Web construction is heavier than general purpose construction making it particularly suitable for cotter pin hole drilling and cross hole drilling in head of bolts. The heavy construction affords efficient drilling in stainless steel and other hard materials. The split point reduces the thrust requirements and minimizes walking.