They are actually stronger than most metal and chemical anchors because the all plastic plug bonds through friction to concrete

1 1/4-7 Slotted Hex Nut Zinc Plated

Fully assembled nut

Material is manufactured with rolled threads

When a screw reaches the collar

#56 Heavy Duty Jobber Drill Bit (12) Wedge Anchors 304 Stainless Steel They are actually stronger than#56 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.