They are actually stronger than most metal and chemical anchors

7/8 x 12 High Speed Long Boy (1/2" Shank)

1-8 x 3 Grade 8 Hex Cap Screw Yellow Zinc Plated

3/8 x 2 1/2 Round Split Drive Anchor Zinc Plated (25)

#47 Heavy Duty Jobber Drill Bit

1 1/2-12 Slotted Hex Nut Zinc Plated Finished Hex Nuts 316 Stainless Steel They are actually stronger than1 1 2 12 Slotted Hex Nut Zinc Plated . Hex nut with opposed slots cut into the top of the nut through the centers of the flats. The slots are on the end opposite the bearing surface. The slots are for the insertion of a cotter pin to secure the nut when used with a drilled shank fastener. Nuts are made from a low carbon steel which conforms to the following chemical composition requirements: Carbon 0. 47% max, Phosphorous 0. 12% max, Sulfur 0. 23%