The 5/16" in diameter S hook is for light applications, such as attaching trailer feed bags to D-rings. 3 1/4" L. 189 lb. working load limit, 567 lb. minimum breaking strength. Steel.
The medium 3/8" in diameter S hook is for medium applications, such as attaching butt chains to the trailer wall. 3 3/8" L. 523 lb. working load limit, 1,292 lb. minimum breaking strength.
The large 7/16" S Hook is for heavier applications, such as attaching trailer safety chains on 2 or 3 horse bumper-pull or tag along trailers.
It's best to match the diameter of the S Hook to the diameter of the chain it's attached to.
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