Double End Eye Swivels - See dimension on our image. If swivels are for parrot related stuff, there should be no concerns when using on toys or hanging most play gyms on these sizes below. However, the small size are more than adequate for parrot use.
For the sizes we carry be sure to read the details for the size you are purchasing for how you will use it.
Small Nickel Plated Double Eye Swivel (also known as Double End Swivel). $1.25 ea.