14Kt Yellow Gold Threadless Curved Bar Top with 4-Prong Lab-Grown Diamond Dangle. Made of solid 14kt nickel-free Gold with durable 316LVM ASTM F-138 Implant Grade Steel Pin designed to be practical and easy to use. Fits all sizes of pins and bases in our threadless body jewelry line. Pin Size: 0.45mm x 4.7mm.