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

3/8-24 x 4 Grade 8 Hex Cap Screw Plain Domestic USA (250)

Countersinks into log

7/8-14 x 5 1/2 L9 Hex Cap Screw Yellow Zinc Plated Domestic USA (15)

1/4-28 x 1/2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (3300)

10-16 x 1 Hex Washer Head Self Drilling Screw Zinc Plated Tek #3 (5000) 5/8-18 Grade 5 Hex Cap Screws Plain - Domestic USA They are actually stronger than10 16 x 1 Hex Washer Head Self Drilling Screw Zinc Plated Tek #3 (5000). A tapping screw with an integrally formed hex washer head , spaced or unified threads, and a #2 or #3 drill point. Designed to drill through steel. AISI 1022 or equivalent steel. Rockwell C50 56. Meets F. I. P. 1000. 7 for torsional strength & drill speed. Meets ASTM A 510 for carbon steel manufacturing. Zinc plating meets ASTM B 117 for salt spray corrosion. Manufactured to SAE