Seachoice Interlocking Safety Spring Hook 4 In.

I bought two of these Seachoice Stainless Steel Safety Spring Hooks and use them to hang a baby swing from an iron man gym over my kitchen door frame. These hooks stay attached to the iron man gym so that I can use the hooks that come with the frame to put up and take down the swing which comes with its own hooks. Attaching hooks to other hooks is much easier than to the iron man gym.