The Celtic Knot piece is said to represent eternity as they are complete loops that have no start or finish. This threadless decorative end is available in 14 karat Yellow Gold, White Gold and Rose Gold options. It measures 6.30mm x 5.75mm and it can be used in any piercing that is fit with a threadless post from all major jewelry vendors.
A threadless end is also needed in order to use these. (sold separately)