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

316 series stainless steel differs from 18-8 by its molybdenum content (2-3%) and a higher nickel content (10-14%)

5/8-11 x 3 Hex Sleeve Anchor Zinc Plated (20)

#55 Heavy Duty Drill Bit - Stubby Length

21/64 Heavy Duty Jobber Drill Bit

9/16-12 x 6 1/2 Socket Cap Screw Alloy 5/8-11 Hex Cap Screws 18-8 Stainless Steel They are actually stronger than9 16 12 x 6 1 2 Socket Cap Screw Alloy . Alloy Socket Head Cap Screws from Brighton Best. Hardness of RC 38 43, meets or exceeds ASTM A574. Manufactured from heat treated alloy steel, 1960 series.