The screw-on hooks are made of 304 stainless steel. These screw hooks are stronger and more durable than those made of iron with a nickel/zinc/vinyl coated surface, and most importantly more reliable for outdoor hanging. Among the product photos, there is has a spec sheet that lists all the necessary dimensions of the cup hook, including overall length, thickness, inside diameter, outside diameter, and wire length.
Heavy Duty Screw Hooks, Threaded Wall Hooks
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