the expansion mechanism compresses and exerts force against the walls of the hole

3/4-10 x 7 1/2 Hex Cap Screw SS 18-8 (A2)

3/8 x 8 Hex Lag Screw 18-8 SS

3/4-10 x 4 1/4 Hex Sleeve Anchor Zinc Plated (10)

#8 Heavy Duty Jobber Drill Bit (12) Spike Impact Anchors 316 Stainless Steel the expansion mechanism compresses and#8 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.